diff --git a/Proiect_java_1/out/production/Proiect_java_1/Main.class b/Proiect_java_1/out/production/Proiect_java_1/Main.class
new file mode 100644
index 000000000..c14bc3796
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Main.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/Employee.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/Employee.class
new file mode 100644
index 000000000..6c804f727
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/Employee.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/EmployeeFactory.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/EmployeeFactory.class
new file mode 100644
index 000000000..cdd07ce26
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/EmployeeFactory.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/HumanAbstractFactory.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/HumanAbstractFactory.class
new file mode 100644
index 000000000..852e4995f
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/HumanAbstractFactory.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/HumanFactory.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/HumanFactory.class
new file mode 100644
index 000000000..bdc94882c
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/HumanFactory.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/Intern.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/Intern.class
new file mode 100644
index 000000000..e31bdeb5e
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/Intern.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/InternFactory.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/InternFactory.class
new file mode 100644
index 000000000..ffaf409eb
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/InternFactory.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/ObservedSubject.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/ObservedSubject.class
new file mode 100644
index 000000000..d8fde1583
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/ObservedSubject.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/Observer.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/Observer.class
new file mode 100644
index 000000000..c691f0c85
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/Observer.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/Supervisor.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/Supervisor.class
new file mode 100644
index 000000000..ae291e62e
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/Supervisor.class differ
diff --git a/Proiect_java_1/out/production/Proiect_java_1/Package1/SupervisorFactory.class b/Proiect_java_1/out/production/Proiect_java_1/Package1/SupervisorFactory.class
new file mode 100644
index 000000000..5451b82a2
Binary files /dev/null and b/Proiect_java_1/out/production/Proiect_java_1/Package1/SupervisorFactory.class differ
diff --git a/Proiect_java_1/src/Main.java b/Proiect_java_1/src/Main.java
new file mode 100644
index 000000000..f42cd4c06
--- /dev/null
+++ b/Proiect_java_1/src/Main.java
@@ -0,0 +1,16 @@
+import Package1.*;
+
+public class Main
+{
+    public static void main(String[] args)
+    {
+        ObservedSubject supervisor1= HumanFactory.getObservedSubject(new SupervisorFactory());
+        Observer intern1=HumanFactory.getObserver(new InternFactory());
+        Observer  employee1=HumanFactory.getObserver(new EmployeeFactory());
+        supervisor1.register(intern1);
+        supervisor1.register(employee1);
+        supervisor1.notify("Excellent work!");
+        System.out.println("Feedback-ul intern-ului si al angajatului este:");
+        System.out.println(intern1.getFeedback());
+    }
+}
diff --git a/Proiect_java_1/src/Package1/Employee.java b/Proiect_java_1/src/Package1/Employee.java
new file mode 100644
index 000000000..d4ebda487
--- /dev/null
+++ b/Proiect_java_1/src/Package1/Employee.java
@@ -0,0 +1,33 @@
+package Package1;
+
+public class Employee implements Observer
+{
+    private String nume;
+    private Integer varsta;
+    private String specializare;
+    private Integer aniExperienta;
+    private String sup;
+    private String feedback;
+
+    public Employee(String n,Integer v,String spec,Integer a,String suup,String fdb)
+    {
+        nume=n;
+        varsta=v;
+        specializare=spec;
+        aniExperienta=a;
+        sup=suup;
+        feedback=fdb;
+    }
+    public Employee()
+    {
+        this("",0,"",0,"","");
+    }
+    public void update(String message)
+    {
+        feedback=message;
+    }
+    public String getFeedback()
+    {
+        return feedback;
+    }
+}
diff --git a/Proiect_java_1/src/Package1/EmployeeFactory.java b/Proiect_java_1/src/Package1/EmployeeFactory.java
new file mode 100644
index 000000000..c83ffa904
--- /dev/null
+++ b/Proiect_java_1/src/Package1/EmployeeFactory.java
@@ -0,0 +1,28 @@
+package Package1;
+
+import java.util.Scanner;
+
+public class EmployeeFactory implements HumanAbstractFactory
+{
+    public Observer createObserver()
+    {
+        System.out.println("Introduceti date despre un nou angajat");
+        Scanner input=new Scanner(System.in);
+        System.out.println("Nume;");
+        String n=input.next();
+        System.out.println("Varsta");
+        Integer v=input.nextInt();
+        System.out.println("Specializare:");
+        String s=input.next();
+        System.out.println("Ani_Experienta: ");
+        Integer ani=input.nextInt();
+        System.out.println("Nume Supervisor:");
+        String sup=input.next();
+        return new Employee(n,v,s,ani,sup,"");
+    }
+
+    @Override
+    public ObservedSubject createObservedSubject() {
+        return null;
+    }
+}
diff --git a/Proiect_java_1/src/Package1/HumanAbstractFactory.java b/Proiect_java_1/src/Package1/HumanAbstractFactory.java
new file mode 100644
index 000000000..bb6214ba9
--- /dev/null
+++ b/Proiect_java_1/src/Package1/HumanAbstractFactory.java
@@ -0,0 +1,7 @@
+package Package1;
+
+public interface HumanAbstractFactory
+{
+    public ObservedSubject createObservedSubject();
+    public Observer createObserver();
+}
diff --git a/Proiect_java_1/src/Package1/HumanFactory.java b/Proiect_java_1/src/Package1/HumanFactory.java
new file mode 100644
index 000000000..ab39ab5f9
--- /dev/null
+++ b/Proiect_java_1/src/Package1/HumanFactory.java
@@ -0,0 +1,13 @@
+package Package1;
+
+public class HumanFactory
+{
+    public static ObservedSubject getObservedSubject(HumanAbstractFactory h)
+    {
+        return h.createObservedSubject();
+    }
+    public static Observer getObserver(HumanAbstractFactory h)
+    {
+        return h.createObserver();
+    }
+}
diff --git a/Proiect_java_1/src/Package1/Intern.java b/Proiect_java_1/src/Package1/Intern.java
new file mode 100644
index 000000000..34691a2d8
--- /dev/null
+++ b/Proiect_java_1/src/Package1/Intern.java
@@ -0,0 +1,33 @@
+package Package1;
+
+public class Intern implements Observer
+{
+    private String nume;
+    private String facultate;
+    private Integer varsta;
+    private boolean experientaAnterioara;
+    private String sup;
+    String feedback;
+
+    public Intern(String n,String f,Integer v,boolean e,String s,String fdb)
+    {
+        nume=n;
+        facultate=f;
+        varsta=v;
+        experientaAnterioara=e;
+        sup=s;
+        feedback=fdb;
+    }
+    public Intern()
+    {
+        this("","",0,false,"","");
+    }
+    public void update(String message)
+    {
+        feedback=message;
+    }
+    public String getFeedback()
+    {
+        return feedback;
+    }
+}
diff --git a/Proiect_java_1/src/Package1/InternFactory.java b/Proiect_java_1/src/Package1/InternFactory.java
new file mode 100644
index 000000000..aa7ae9a7d
--- /dev/null
+++ b/Proiect_java_1/src/Package1/InternFactory.java
@@ -0,0 +1,28 @@
+package Package1;
+
+import java.util.Scanner;
+
+public class InternFactory implements HumanAbstractFactory
+{
+    public Observer createObserver()
+    {
+        System.out.println("Introduceti date despre un nou intern");
+        Scanner input=new Scanner(System.in);
+        System.out.println("Nume;");
+        String n=input.next();
+        System.out.println("Facultate");
+        String f=input.next();
+        System.out.println("Varsta:");
+        Integer v=input.nextInt();
+        System.out.println("Experienta:(True/False) ");
+        boolean e=input.nextBoolean();
+        System.out.println("Nume Supervisor:");
+        String sup=input.next();
+        return new Intern(n,f,v,e,sup,"");
+    }
+
+    @Override
+    public ObservedSubject createObservedSubject() {
+        return null;
+    }
+}
diff --git a/Proiect_java_1/src/Package1/ObservedSubject.java b/Proiect_java_1/src/Package1/ObservedSubject.java
new file mode 100644
index 000000000..1d85607ff
--- /dev/null
+++ b/Proiect_java_1/src/Package1/ObservedSubject.java
@@ -0,0 +1,7 @@
+package Package1;
+
+public interface ObservedSubject {
+    void register(Observer obj);
+    void unregister(Observer obj);
+    void notify(String message);
+}
diff --git a/Proiect_java_1/src/Package1/Observer.java b/Proiect_java_1/src/Package1/Observer.java
new file mode 100644
index 000000000..c9d68ba28
--- /dev/null
+++ b/Proiect_java_1/src/Package1/Observer.java
@@ -0,0 +1,7 @@
+package Package1;
+
+public interface Observer {
+    void update(String message);
+
+    public String getFeedback();
+}
diff --git a/Proiect_java_1/src/Package1/Supervisor.java b/Proiect_java_1/src/Package1/Supervisor.java
new file mode 100644
index 000000000..e59a9b488
--- /dev/null
+++ b/Proiect_java_1/src/Package1/Supervisor.java
@@ -0,0 +1,50 @@
+package Package1;
+
+import java.util.Arrays;
+
+public class Supervisor implements ObservedSubject
+{
+    private Observer[] observers=new Observer[0];
+
+    private String nume;
+    private String departament;
+    private Integer varsta;
+
+    public Supervisor(String n,String d,Integer v)
+    {
+        nume=n;
+        departament=d;
+        varsta=v;
+    }
+    public Supervisor()
+    {
+        this("","",0);
+    }
+
+    public void register(Observer obs)
+    {
+        this.observers= Arrays.copyOf(observers,observers.length+1);
+        observers[this.observers.length-1]=obs;
+    }
+    public void unregister(Observer obs)
+    {
+        int removedIndex=-1;
+        for(int i=0;i< observers.length;i++)
+        {
+            if(observers[i].equals(obs))
+            {
+                removedIndex = i;
+                break;
+            }
+        }
+        System.arraycopy(observers,removedIndex+1,observers,removedIndex,observers.length-removedIndex-1);
+    }
+
+    public void notify(String message)
+    {
+        for(int i=0;i<observers.length;i++)
+        {
+            observers[i].update(message);
+        }
+    }
+}
diff --git a/Proiect_java_1/src/Package1/SupervisorFactory.java b/Proiect_java_1/src/Package1/SupervisorFactory.java
new file mode 100644
index 000000000..736a8eaf3
--- /dev/null
+++ b/Proiect_java_1/src/Package1/SupervisorFactory.java
@@ -0,0 +1,25 @@
+package Package1;
+
+import java.util.Scanner;
+
+public class SupervisorFactory implements HumanAbstractFactory
+{
+    public ObservedSubject createObservedSubject()
+    {
+        System.out.println("Introduceti date despre nou Supervisor:");
+        Scanner input=new Scanner(System.in);
+        System.out.println("Nume:");
+        String nume=input.next();
+        System.out.println("Departament: ");
+        String dep=input.next();
+        System.out.println("Varsta: ");
+        Integer v=input.nextInt();
+        return new Supervisor(nume,dep,v);
+    }
+
+    @Override
+    public Observer createObserver() {
+        return null;
+    }
+}
+
diff --git a/_1_basics/src/main/java/code/_2_challenge/_2_foobarqix/FooBarQix.java b/_1_basics/src/main/java/code/_2_challenge/_2_foobarqix/FooBarQix.java
index 01dd73cce..cc3cb7621 100644
--- a/_1_basics/src/main/java/code/_2_challenge/_2_foobarqix/FooBarQix.java
+++ b/_1_basics/src/main/java/code/_2_challenge/_2_foobarqix/FooBarQix.java
@@ -9,13 +9,10 @@ public String compute(int i) {
 
         char[] digits = String.valueOf(i).toCharArray();
         for (char digit : digits) {
-
             if (digit == '3') s += "Foo";
             if (digit == '5') s += "Bar";
             if (digit == '7') s += "Qix";
-
         }
-
         if (s.isEmpty()) {
             s = String.valueOf(i);
         }
@@ -48,7 +45,6 @@ public String compute2(int i) {
             else if (digit == '0') s += "*";
             else if (!isDivisible) s += digit;
         }
-
         return s;
     }
 }
\ No newline at end of file
diff --git a/_1_basics/src/main/java/code/_3_in_class/Main.java b/_1_basics/src/main/java/code/_3_in_class/Main.java
index 3b87b4563..44a0865ff 100644
--- a/_1_basics/src/main/java/code/_3_in_class/Main.java
+++ b/_1_basics/src/main/java/code/_3_in_class/Main.java
@@ -4,5 +4,6 @@ public class Main {
 
     public static void main(String[] args) {
         //TODO put your code changes in here
+        //jskdfjk
     }
 }
\ No newline at end of file
diff --git a/_1_basics/src/main/java/code/_4_student_effort/FizzBuzz/FizzBuzz.java b/_1_basics/src/main/java/code/_4_student_effort/FizzBuzz/FizzBuzz.java
new file mode 100644
index 000000000..d396e7267
--- /dev/null
+++ b/_1_basics/src/main/java/code/_4_student_effort/FizzBuzz/FizzBuzz.java
@@ -0,0 +1,17 @@
+package code._4_student_effort.FizzBuzz;
+
+public class FizzBuzz
+{
+        public void FizzBuzz(int n)
+        {
+            for(int i=0;i<n;i++)
+            {
+                if(i%3==0) System.out.print("Fizz");
+                if(i%5==0) System.out.print("Buzz");
+                if(i%3!=0&&i%5!=0)
+                    System.out.print(i);
+                System.out.print(" , ");
+            }
+        }
+
+}
diff --git a/_1_basics/src/main/java/code/_4_student_effort/FooBarQix/FooBarQix.java b/_1_basics/src/main/java/code/_4_student_effort/FooBarQix/FooBarQix.java
new file mode 100644
index 000000000..b6f072ad7
--- /dev/null
+++ b/_1_basics/src/main/java/code/_4_student_effort/FooBarQix/FooBarQix.java
@@ -0,0 +1,56 @@
+package code._4_student_effort.FooBarQix;
+
+public class FooBarQix
+{
+    public String compute(int n)
+    {
+        String s="";
+        int nr1;
+        int nr2;
+
+        nr1=se_divide(n,3);
+        for(int i=0;i<nr1;i++)
+            s=s+"FOO";
+        nr2=se_gaseste(n,3);
+        for(int i=0;i<nr2;i++)
+            s=s+"FOO";
+
+        nr1=se_divide(n,5);
+        for(int i=0;i<nr1;i++)
+            s=s+"BAR";
+        nr2=se_gaseste(n,5);
+        for(int i=0;i<nr2;i++)
+            s=s+"BAR";
+
+        nr1=se_divide(n,7);
+        for(int i=0;i<nr1;i++)
+            s=s+"QIX";
+        nr2=se_gaseste(n,7);
+        for(int i=0;i<nr2;i++)
+            s=s+"QIX";
+
+        return s;
+    }
+    public int se_divide(int n,int a)
+    {
+        int nr=0;
+        while(n!=0)
+        {
+            if(n%a==0)
+                nr++;
+            n=n/10;
+        }
+        return nr;
+    }
+    public int se_gaseste(int n,int a)
+    {
+        int nr=0;
+        while(n!=0)
+        {
+            if(n%10==a)
+                nr++;
+            n=n/10;
+        }
+        return  nr;
+    }
+}
diff --git a/_1_basics/src/main/java/code/_4_student_effort/Main.java b/_1_basics/src/main/java/code/_4_student_effort/Main.java
index 95bb1182c..51ffee988 100644
--- a/_1_basics/src/main/java/code/_4_student_effort/Main.java
+++ b/_1_basics/src/main/java/code/_4_student_effort/Main.java
@@ -1,8 +1,42 @@
 package code._4_student_effort;
 
+import code._4_student_effort.FizzBuzz.FizzBuzz;
+import code._4_student_effort.FooBarQix.FooBarQix;
+import code._4_student_effort.Pair_of_2.Pair_of_2;
+import code._4_student_effort.Pair_of_3.Pair_of_3;
+
 public class Main {
 
-    public static void main(String[] args) {
-        //TODO put your code changes in here
+    public static void main(String[] args)
+    {
+        // Challenge 1 - verificare
+        /*FizzBuzz obiect=new FizzBuzz();
+        obiect.FizzBuzz(40);*/
+
+        //Challenge 2 - verificare
+        FooBarQix object2=new FooBarQix();
+        for(int i=0;i<=15;i++)
+        {
+            String rez;
+            rez=object2.compute(i);
+            if(rez.equals(""))
+                System.out.print(i+" , ");
+            else
+                System.out.print(rez+ " , ");
+        }
+
+        //Chalenge 3 - verficare
+    /*    Pair_of_2 a=new Pair_of_2();
+        int []v={1,2,3,2,-1,-2,-2,-2,-3};
+        int nr=0;
+        nr=a.nr_of_pairs(v);
+        System.out.println("Nr de pereschi este de "+ nr);*/
+
+        //Cjallenge 4 - Verificare
+       /* Pair_of_3 p=new Pair_of_3();
+        int []v={-1,-1,-1,2};
+        int nr1=0;
+        nr1=p.nr_of_pairs(v);
+        System.out.println("Nr de pereschi este de "+ nr1);*/
     }
 }
diff --git a/_1_basics/src/main/java/code/_4_student_effort/Pair_of_2/Pair_of_2.java b/_1_basics/src/main/java/code/_4_student_effort/Pair_of_2/Pair_of_2.java
new file mode 100644
index 000000000..326f9dd77
--- /dev/null
+++ b/_1_basics/src/main/java/code/_4_student_effort/Pair_of_2/Pair_of_2.java
@@ -0,0 +1,39 @@
+package code._4_student_effort.Pair_of_2;
+
+public class Pair_of_2 {
+    public int nr_of_pairs(int[] v)
+    {
+        int[] aux = new int[v.length];
+        boolean exista1;
+        boolean exista2;
+        int nr = 0;
+        int index = 0;
+        for (int i = 0; i < v.length - 1; i++)
+        {
+            exista1 = false;
+            for (int k = 0; k < aux.length; k++) {
+                if (i == aux[k])
+                    exista1 = true;
+            }
+            if (exista1 == false)
+                for (int j = i + 1; j < v.length; j++)
+                {
+                    exista2=false;
+                    for (int k = 0; k < aux.length; k++)
+                        if (j == aux[k])
+                            exista2 = true;
+                    if(exista2==false)
+                    {
+                        if (v[i]+v[j]==0)
+                        {
+                            nr++;
+                            aux[index] = i;
+                            aux[index + 1] = j;
+                            index = index + 2;
+                        }
+                    }
+                 }
+        }
+        return nr;
+    }
+}
diff --git a/_1_basics/src/main/java/code/_4_student_effort/Pair_of_3/Pair_of_3.java b/_1_basics/src/main/java/code/_4_student_effort/Pair_of_3/Pair_of_3.java
new file mode 100644
index 000000000..7edb1d40e
--- /dev/null
+++ b/_1_basics/src/main/java/code/_4_student_effort/Pair_of_3/Pair_of_3.java
@@ -0,0 +1,30 @@
+package code._4_student_effort.Pair_of_3;
+
+public class Pair_of_3
+{
+    public int nr_of_pairs(int [] v)
+    {
+        int nr=0;
+        int index=0;
+        int [] aux=new int[v.length];
+        for(int i=0;i<v.length-2;i++)
+            for(int j=i+1;j<v.length-1;j++)
+                for(int k=j+1;k<v.length;k++)
+                {
+                    boolean exista=false;
+                    for(int l=0;l<aux.length;l++)
+                        if(i==aux[l]||j==aux[l]||k==aux[l])
+                            exista=true;
+                    if(exista==false&&(v[i]+v[j]+v[k]==0))
+                    {
+                        nr++;
+                        aux[index]=i;
+                        aux[index+1]=j;
+                        aux[index+2]=k;
+                        index=index+3;
+                        break;
+                    }
+                }
+        return nr;
+    }
+}
diff --git a/_1_basics/src/out/production/main/code/_1_study/_1_hello_world/HelloWorld.class b/_1_basics/src/out/production/main/code/_1_study/_1_hello_world/HelloWorld.class
new file mode 100644
index 000000000..cb8444203
Binary files /dev/null and b/_1_basics/src/out/production/main/code/_1_study/_1_hello_world/HelloWorld.class differ
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diff --git a/_1_basics/src/out/production/main/code/_1_study/_6_accessing_private_fields/Student.class b/_1_basics/src/out/production/main/code/_1_study/_6_accessing_private_fields/Student.class
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diff --git a/_1_basics/src/out/production/main/code/_2_challenge/_1_fizzbuzz/NumberWordCorrelation.class b/_1_basics/src/out/production/main/code/_2_challenge/_1_fizzbuzz/NumberWordCorrelation.class
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diff --git a/_1_basics/src/out/production/main/code/_2_challenge/_2_foobarqix/FooBarQix.class b/_1_basics/src/out/production/main/code/_2_challenge/_2_foobarqix/FooBarQix.class
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diff --git a/_1_basics/src/out/production/main/code/_2_challenge/_3_pair_of_2/PairOf2.class b/_1_basics/src/out/production/main/code/_2_challenge/_3_pair_of_2/PairOf2.class
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diff --git a/_1_basics/src/out/production/main/code/_2_challenge/_4_pair_of_3/PairOf3.class b/_1_basics/src/out/production/main/code/_2_challenge/_4_pair_of_3/PairOf3.class
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diff --git a/_1_basics/src/out/production/main/code/_3_in_class/HelloWorld.class b/_1_basics/src/out/production/main/code/_3_in_class/HelloWorld.class
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diff --git a/_1_basics/src/out/production/main/code/_3_in_class/Main.class b/_1_basics/src/out/production/main/code/_3_in_class/Main.class
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diff --git a/_1_basics/src/out/production/main/code/_4_student_effort/FizzBuzz/FizzBuzz.class b/_1_basics/src/out/production/main/code/_4_student_effort/FizzBuzz/FizzBuzz.class
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diff --git a/_1_basics/src/out/production/main/code/_4_student_effort/FooBarQix/FooBarQix.class b/_1_basics/src/out/production/main/code/_4_student_effort/FooBarQix/FooBarQix.class
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diff --git a/_1_basics/src/out/production/main/code/_4_student_effort/Main.class b/_1_basics/src/out/production/main/code/_4_student_effort/Main.class
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diff --git a/_1_basics/src/out/production/main/code/_4_student_effort/Pair_of_2/Pair_of_2.class b/_1_basics/src/out/production/main/code/_4_student_effort/Pair_of_2/Pair_of_2.class
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index 000000000..38154cfff
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diff --git a/_1_basics/src/out/production/main/code/_4_student_effort/Pair_of_3/Pair_of_3.class b/_1_basics/src/out/production/main/code/_4_student_effort/Pair_of_3/Pair_of_3.class
new file mode 100644
index 000000000..b7fadc840
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diff --git a/_2_oo/src/main/java/code/_2_challenge/_2_movie_database/Studio.java b/_2_oo/src/main/java/code/_2_challenge/_2_movie_database/Studio.java
index 5cfc00e0d..f0794ba68 100644
--- a/_2_oo/src/main/java/code/_2_challenge/_2_movie_database/Studio.java
+++ b/_2_oo/src/main/java/code/_2_challenge/_2_movie_database/Studio.java
@@ -4,8 +4,8 @@ public class Studio {
     public String nume;
     public Film[] filme;
 
-    public Studio(String nume, Film[] filme) {
+    public Studio(String nume, Film[] filme)
+    {
         this.nume = nume;
         this.filme = filme;
     }
-}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/Main.java b/_2_oo/src/main/java/code/_4_student_effort/Main.java
index 95bb1182c..7a57cb695 100644
--- a/_2_oo/src/main/java/code/_4_student_effort/Main.java
+++ b/_2_oo/src/main/java/code/_4_student_effort/Main.java
@@ -1,8 +1,80 @@
 package code._4_student_effort;
 
+import code._4_student_effort._2_movie_database.Actor;
+import code._4_student_effort._2_movie_database.Film;
+import code._4_student_effort._2_movie_database.Studio;
+import code._4_student_effort._2_movie_database.Premiu;
+import code._4_student_effort._1_two_fighters.BoxingMatch;
+import code._4_student_effort._1_two_fighters.Fighter;
+
 public class Main {
 
-    public static void main(String[] args) {
-        //TODO put your code changes in here
+    public static void main(String[] args)
+    {
+        Fighter f1=new Fighter("Fabian",100,30);
+        Fighter f2=new Fighter("Andra",70,20);
+        BoxingMatch match1=new BoxingMatch(f1,f2);
+        BoxingMatch matche2=new BoxingMatch();
+        String winner=match1.fight();
+        System.out.println("Castigatorul meciului este "+ winner);
+
+        Premiu oscar1990 = new Premiu("oscar", 1990);
+        Premiu oscar2000 = new Premiu("oscar", 2000);
+        Premiu oscar2010 = new Premiu("oscar", 2010);
+        Premiu oscar2018 = new Premiu("oscar", 2018);
+        Premiu p=new Premiu();
+
+        Actor actorOscar1990 = new Actor("actor cu 2 oscaruri", 35, new Premiu[]{oscar1990,oscar2000});
+        Actor actorOscar2010 = new Actor("actor cu oscar din 2000", 55,new Premiu []{oscar2000,oscar1990});
+        Actor actorOscar2018 = new Actor("actor cu oscar din 2018", 23, new Premiu[]{oscar2018,oscar2010,oscar2000});
+        Actor actorFaraPremii01 = new Actor("actor fara oscar 01", 33, new Premiu[]{oscar2000,oscar1990});
+        Actor actorFaraPremii02 = new Actor("actor fara oscar 02", 60, new Premiu[]{});
+        Actor actorFaraPremii03 = new Actor("actor fara oscar 02", 20, new Premiu[]{});
+
+        Film film1 = new Film("a", 12, new Actor[]{actorOscar1990, actorFaraPremii01});
+        Film film2 = new Film("d", 23, new Actor[]{actorFaraPremii01, actorFaraPremii02, actorFaraPremii03});
+        Film film3 = new Film("d", 44, new Actor[]{actorFaraPremii01, actorFaraPremii02, actorFaraPremii03});
+        Film film4 = new Film("c", 55, new Actor[]{actorOscar2010, actorOscar2018, actorFaraPremii02});
+        Film film5 = new Film("s", 66, new Actor[]{actorFaraPremii02, actorFaraPremii03});
+
+        Studio studio1 = new Studio("MGM", new Film[]{film1, film2});
+        Studio studio2 = new Studio("Disney", new Film[]{film3, film4, film5});
+
+        Studio[] studioDatabase = new Studio[]{studio1, studio2};
+        //studio1.afisare();
+        //studio_with_Moreth2_movies(studioDatabase);
+        ex_2(studioDatabase);
+        ex_3(studioDatabase);
+    }
+    public static void studio_with_Moreth2_movies(Studio [] v)
+    {
+        for(int i=0;i<v.length;i++)
+            if(v[i].getFilme().length>=2)
+                System.out.println(v[i].getNume());
+    }
+    public static void ex_2(Studio [] v)
+    {
+        for(int i=0;i<v.length;i++)
+            for(int j=0;j<v[i].getFilme().length;j++)
+                for(int k=0;k<v[i].getFilme()[j].getActori().length;k++)
+                    if(v[i].getFilme()[j].getActori()[k].getNume().equals("actor cu 2 oscaruri"))
+                        System.out.println(v[i].getNume());
+
+    }
+    public static void ex_3(Studio [] v)
+    {
+        for(int i=0;i<v.length;i++)
+            for(int j=0;j<v[i].getFilme().length;j++)
+            {
+                boolean exista = false;
+                for (int k = 0; k < v[i].getFilme()[j].getActori().length; k++)
+                {
+                    if (v[i].getFilme()[j].getActori()[k].getVarsta()> 50)
+                        exista = true;
+                    if (exista)
+                    {System.out.println(v[i].getFilme()[j].getNume());
+                    break;}
+                }
+            }
     }
 }
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_1_two_fighters/BoxingMatch.java b/_2_oo/src/main/java/code/_4_student_effort/_1_two_fighters/BoxingMatch.java
new file mode 100644
index 000000000..f174a14a5
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_1_two_fighters/BoxingMatch.java
@@ -0,0 +1,31 @@
+package code._4_student_effort._1_two_fighters;
+
+public class BoxingMatch
+{
+    protected Fighter f1,f2;
+
+    public BoxingMatch(Fighter f1,Fighter f2)
+    {
+        this.f1=f1;
+        this.f2=f2;
+    }
+
+    public BoxingMatch()
+    {
+        f1=new Fighter();
+        f2=new Fighter();
+    }
+    public String fight()
+    {
+        while(f1.health!=0&&f2.health!=0)
+        {
+            f1.attack(f2);
+            if(f2.health==0)
+                return f1.name;
+            f2.attack(f1);
+            if(f1.health==0)
+                return f2.name;
+        }
+        return f1.name;
+    }
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_1_two_fighters/Fighter.java b/_2_oo/src/main/java/code/_4_student_effort/_1_two_fighters/Fighter.java
new file mode 100644
index 000000000..4ad6b31a7
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_1_two_fighters/Fighter.java
@@ -0,0 +1,53 @@
+package code._4_student_effort._1_two_fighters;
+
+public class Fighter
+{
+    protected String name;
+    protected int health;
+    protected int damagePerAttack;
+
+    public Fighter()
+    {
+        super();
+        name="";
+        damagePerAttack=0;
+        health=0;
+    }
+    public Fighter(String n,int h, int d)
+    {
+        name=n;
+        health=h;
+        damagePerAttack=d;
+    }
+
+    public void setName(String n)
+    {
+        name=n;
+    }
+    public void setHealth(int h)
+    {
+        health=h;
+    }
+    public void setDamagePerAttack(int d)
+    {
+        damagePerAttack=d;
+    }
+    public String getName()
+    {
+        return name;
+    }
+    public int getDamagePerAttack()
+    {
+        return damagePerAttack;
+    }
+    public int getHealth()
+    {
+        return health;
+    }
+    public void attack(Fighter f)
+    {
+        f.health=f.health-this.damagePerAttack;
+        if(f.health<0)
+            f.health=0;
+    }
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Actor.java b/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Actor.java
new file mode 100644
index 000000000..763ea1c10
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Actor.java
@@ -0,0 +1,37 @@
+package code._4_student_effort._2_movie_database;
+
+public class Actor
+{
+    protected String nume;
+    protected int varsta;
+    protected Premiu [] premii;
+
+    public Actor()
+    {
+        nume="";
+        varsta=0;
+        premii=null;
+    }
+    public Actor(String s,int v,Premiu [] p)
+    {
+        nume=s;
+        varsta=v;
+       premii=p;
+    }
+    public String getNume()
+    {
+        return nume;
+    }
+    public int getVarsta()
+    {
+        return varsta;
+    }
+    public void afisare()
+    {
+        System.out.println("Actor: Nume"+nume+" / Varsta:"+varsta);
+        for(int i=0;i< premii.length;i++)
+        {
+            premii[i].afisare();
+        }
+    }
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Film.java b/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Film.java
new file mode 100644
index 000000000..9e3814ad3
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Film.java
@@ -0,0 +1,37 @@
+package code._4_student_effort._2_movie_database;
+
+public class Film
+{
+    protected String nume;
+    protected int anAparitie;
+    protected Actor [] actori;
+
+    public Film()
+    {
+        nume="";
+        anAparitie=0;
+        actori=null;
+    }
+    public Film(String n,int an,Actor [] a)
+    {
+        nume=n;
+        anAparitie=an;
+        actori=a;
+    }
+    public Actor[] getActori()
+    {
+        return actori;
+    }
+    public String getNume()
+    {
+        return nume;
+    }
+    public void afisare()
+    {
+        System.out.println("Film: Nume: "+nume+" / An: "+anAparitie);
+        for(int i=0;i<actori.length;i++)
+        {
+            actori[i].afisare();
+        }
+    }
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Premiu.java b/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Premiu.java
new file mode 100644
index 000000000..3dae76150
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Premiu.java
@@ -0,0 +1,24 @@
+package code._4_student_effort._2_movie_database;
+
+public class Premiu
+{
+    protected String nume;
+    protected int an;
+
+    public Premiu()
+    {
+        nume="";
+        an=0;
+    }
+    public Premiu(String n, int a)
+    {
+        nume=n;
+        an=a;
+    }
+    public void afisare()
+    {
+        System.out.println("Premiu: Nume: "+nume+" / An:"+an);
+    }
+
+}
+
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Studio.java b/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Studio.java
new file mode 100644
index 000000000..810642781
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_2_movie_database/Studio.java
@@ -0,0 +1,37 @@
+package code._4_student_effort._2_movie_database;
+
+public class Studio
+{
+    protected String nume;
+    protected Film [] filme;
+
+    public Studio()
+    {
+        nume="";
+        filme=null;
+    }
+
+    public Studio(String n,Film [] f)
+    {
+        nume=n;
+        filme=f;
+    }
+
+    public void afisare()
+    {
+        System.out.println("Studio: "+nume);
+        for(int i=0;i< filme.length;i++)
+        {
+            filme[i].afisare();
+        }
+    }
+    public Film[] getFilme()
+    {
+         return filme;
+    }
+
+    public String getNume()
+    {
+        return nume;
+    }
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Animal.java b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Animal.java
new file mode 100644
index 000000000..4d883cf34
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Animal.java
@@ -0,0 +1,21 @@
+package code._4_student_effort._3_animal_hierarchy;
+
+public abstract class Animal
+{
+    protected int legs;
+
+
+    protected Animal()
+    {
+        legs=0;
+    }
+    protected Animal(int l)
+    {
+        legs=l;
+    }
+    public abstract void eat();
+    public void walk()
+    {
+        System.out.println("Animalul merge folosind nr de picioare: "+legs);
+    }
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Cat.java b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Cat.java
new file mode 100644
index 000000000..f135e90ea
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Cat.java
@@ -0,0 +1,32 @@
+package code._4_student_effort._3_animal_hierarchy;
+
+public class Cat extends Animal implements Pet
+{
+    protected String name;
+
+    public Cat()
+    {
+        this("");
+    }
+    public Cat(String nume)
+    {
+        super(4);
+        name=nume;
+    }
+    public void eat()
+    {
+        System.out.println("Pisica mananca soareci!");
+    }
+    public String getName()
+    {
+        return name;
+    }
+    public void setName(String name)
+    {
+        this.name=name;
+    }
+    public void play()
+    {
+        System.out.println("Se joaca cu mingea");
+    }
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Fish.java b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Fish.java
new file mode 100644
index 000000000..a6bf8cc87
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Fish.java
@@ -0,0 +1,36 @@
+package code._4_student_effort._3_animal_hierarchy;
+
+public class Fish extends Animal implements Pet
+{
+    protected String name;
+
+    public Fish(String name)
+    {
+        super(0);
+        this.name=name;
+    }
+    public Fish()
+    {
+        this("");
+    }
+    public void eat()
+    {
+        System.out.println("Mananca aleg");
+    }
+    public void walk()
+    {
+        System.out.println("Nu mereg, doar inoata");
+    }
+    public void setName(String name)
+    {
+        this.name=name;
+    }
+    public String getName()
+    {
+        return name;
+    }
+    public void play()
+    {
+        System.out.println("Se joaca in apa singur");
+    }
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Pet.java b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Pet.java
new file mode 100644
index 000000000..35702edbb
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Pet.java
@@ -0,0 +1,8 @@
+package code._4_student_effort._3_animal_hierarchy;
+
+public interface Pet
+{
+    abstract public String getName();
+    abstract public void setName(String name);
+    abstract void play();
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Spider.java b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Spider.java
new file mode 100644
index 000000000..f5f52db06
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/Spider.java
@@ -0,0 +1,17 @@
+package code._4_student_effort._3_animal_hierarchy;
+
+public class Spider extends Animal
+{
+    public Spider()
+    {
+        super(8);
+    }
+    public Spider(int l)
+    {
+        super(l);
+    }
+    public void eat()
+    {
+        System.out.println("Mananca numai musculite");
+    }
+}
diff --git a/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/TestAnimals.java b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/TestAnimals.java
new file mode 100644
index 000000000..46d19f738
--- /dev/null
+++ b/_2_oo/src/main/java/code/_4_student_effort/_3_animal_hierarchy/TestAnimals.java
@@ -0,0 +1,14 @@
+package code._4_student_effort._3_animal_hierarchy;
+
+public class TestAnimals
+{
+    public static void main(String[] args)
+    {
+        Fish d=new Fish();
+        Cat c=new Cat("Ana");
+        Animal a=new Fish();
+        Animal e=new Spider();
+        Pet p=new Cat();
+        System.out.println("Ce face puiu?");
+    }
+}
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diff --git a/_2_oo/src/out/production/_2_oo/code/_4_student_effort/_3_animal_hierarchy/Spider.class b/_2_oo/src/out/production/_2_oo/code/_4_student_effort/_3_animal_hierarchy/Spider.class
new file mode 100644
index 000000000..9ccf4cd50
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diff --git a/_2_oo/src/out/production/_2_oo/code/_4_student_effort/_3_animal_hierarchy/TestAnimals.class b/_2_oo/src/out/production/_2_oo/code/_4_student_effort/_3_animal_hierarchy/TestAnimals.class
new file mode 100644
index 000000000..1d583a80c
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diff --git a/_3_design_patterns/src/main/java/code/_2_challenge/_5_template_method/TemplateMethodBubleSort.java b/_3_design_patterns/src/main/java/code/_2_challenge/_5_template_method/TemplateMethodBubleSort.java
index a1cfdbcb5..f65b2dddf 100644
--- a/_3_design_patterns/src/main/java/code/_2_challenge/_5_template_method/TemplateMethodBubleSort.java
+++ b/_3_design_patterns/src/main/java/code/_2_challenge/_5_template_method/TemplateMethodBubleSort.java
@@ -5,7 +5,8 @@ public abstract class TemplateMethodBubleSort {
     public void sort(Integer[] list) {
         for (int i = 0; i < list.length - 1; i++) {
             for (int j = i + 1; j < list.length; j++) {
-                if (numbersInCorrectOrder(list[i], list[j])) {
+                if (numbersInCorrectOrder(list[i], list[j]))
+                {
                     Integer temp = list[i];
                     list[i] = list[j];
                     list[j] = temp;
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/Main.java b/_3_design_patterns/src/main/java/code/_4_student_effort/Main.java
index 95bb1182c..f03cabb69 100644
--- a/_3_design_patterns/src/main/java/code/_4_student_effort/Main.java
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/Main.java
@@ -1,8 +1,16 @@
 package code._4_student_effort;
 
-public class Main {
+import code._4_student_effort._1_iterator.ArrayCustomIterator;
 
-    public static void main(String[] args) {
-        //TODO put your code changes in here
+public class Main
+{
+    public static void main(String[] args)
+    {
+        /* // Exercitiul 1
+        int[] arr=new int[] {1,2,3};
+        ArrayCustomIterator it=new ArrayCustomIterator(arr);
+        while(it.hasnext())
+            System.out.println(it.next());
+         */
     }
 }
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_1_iterator/ArrayCustomIterator.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_1_iterator/ArrayCustomIterator.java
new file mode 100644
index 000000000..36154e9cb
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_1_iterator/ArrayCustomIterator.java
@@ -0,0 +1,26 @@
+package code._4_student_effort._1_iterator;
+
+import java.lang.reflect.Array;
+
+public class ArrayCustomIterator
+{
+    private int [] arr;
+    private int currentindex;
+
+    public ArrayCustomIterator(int [] arr)
+    {
+        this.arr=arr;
+        this.currentindex=0;
+    }
+    public boolean hasnext()
+    {
+        if(this.currentindex!=this.arr.length)
+            return true;
+        return false;
+    }
+    public int next()
+    {
+        this.currentindex=this.currentindex+1;
+        return this.arr[currentindex-1];
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/BubleSort.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/BubleSort.java
new file mode 100644
index 000000000..7f96b2dc4
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/BubleSort.java
@@ -0,0 +1,17 @@
+package code._4_student_effort._2_strategy;
+
+public class BubleSort implements SortingStrategy
+{
+    public void sort(int [] v)
+    {
+        for(int i=0;i<v.length-1;i++)
+            for(int j=i+1;j<v.length;j++)
+                if(v[i]>v[j])
+                {
+                    int aux;
+                    aux=v[i];
+                    v[i]=v[j];
+                    v[j]=aux;
+                }
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/MergeSort.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/MergeSort.java
new file mode 100644
index 000000000..c4dd090b9
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/MergeSort.java
@@ -0,0 +1,39 @@
+package code._4_student_effort._2_strategy;
+
+import java.util.Arrays;
+
+public class MergeSort implements SortingStrategy
+{
+    public void sort(int [] list) {
+        if (list.length < 2) {
+            return;
+        }
+        int mid = list.length / 2;
+        int [] left = Arrays.copyOfRange(list, 0, mid);
+        int[] right = Arrays.copyOfRange(list, mid, list.length);
+
+        sort(left);
+        sort(right);
+        merge(left, right, list);
+    }
+
+    private void merge(int [] left, int [] right, int [] list) {
+        int leftIndex = 0;
+        int rightIndex = 0;
+        int listIndex = 0;
+
+        while (leftIndex < left.length && rightIndex < right.length) {
+            if (left[leftIndex]>right[rightIndex]) {
+                list[listIndex++] = left[leftIndex++];
+            } else {
+                list[listIndex++] = right[rightIndex++];
+            }
+        }
+        while (leftIndex < left.length) {
+            list[listIndex++] = left[leftIndex++];
+        }
+        while (rightIndex < right.length) {
+            list[listIndex++] = right[rightIndex++];
+        }
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/SortingStrategy.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/SortingStrategy.java
new file mode 100644
index 000000000..71b0746c8
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/SortingStrategy.java
@@ -0,0 +1,6 @@
+package code._4_student_effort._2_strategy;
+
+public interface SortingStrategy
+{
+    public void sort(int [] v);
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/StrategyExample.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/StrategyExample.java
new file mode 100644
index 000000000..9e9c43b6e
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_2_strategy/StrategyExample.java
@@ -0,0 +1,21 @@
+package code._4_student_effort._2_strategy;
+
+import java.util.Arrays;
+
+public class StrategyExample
+{
+    public static void main(String[] args)
+    {
+        int [] arr=new int[] {1,4,5,2,3,6,9,8,7};
+        int [] copy01ofArr= Arrays.copyOf(arr,arr.length);
+        int [] copy02ofArr=Arrays.copyOf(arr,arr.length);
+        displaySorted(new BubleSort(),copy01ofArr);
+        displaySorted(new MergeSort(),copy02ofArr);
+    }
+    public static void displaySorted(SortingStrategy strategy,int [] v)
+    {
+        strategy.sort(v);
+        for(int i=0;i<v.length;i++)
+            System.out.println(v[i]);
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_3_proxy/Apartment.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_3_proxy/Apartment.java
new file mode 100644
index 000000000..bb0fe096f
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_3_proxy/Apartment.java
@@ -0,0 +1,21 @@
+package code._4_student_effort._3_proxy;
+
+public class Apartment
+{
+    private String location;
+    private int monthlyRentCost;
+
+    public Apartment(String a, int b)
+    {
+        location=a;
+        monthlyRentCost=b;
+    }
+    public Apartment()
+    {
+        this("",0);
+    }
+    public int getMonthlyRentCost()
+    {
+        return monthlyRentCost;
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_3_proxy/RealEstateAgentProxy.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_3_proxy/RealEstateAgentProxy.java
new file mode 100644
index 000000000..743895415
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_3_proxy/RealEstateAgentProxy.java
@@ -0,0 +1,25 @@
+package code._4_student_effort._3_proxy;
+
+import java.util.Arrays;
+
+public class RealEstateAgentProxy {
+    private Apartment[] appartments = new Apartment[0];
+
+    public void represent(Apartment apartament) {
+        this.appartments = Arrays.copyOf(this.appartments, this.appartments.length + 1);
+        this.appartments[this.appartments.length - 1] = apartament;
+    }
+
+    public Apartment rent(Student student) {
+        Apartment rentedAppartment = null;
+        if (!(student.getName().startsWith("P"))) {
+            for (int i = 0; i < appartments.length; i++) {
+                if (this.appartments[i].getMonthlyRentCost() < student.getMoney()) {
+                    rentedAppartment = appartments[i];
+                    int removeIndex = i;
+                }
+            }
+        }
+        return rentedAppartment;
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_3_proxy/Student.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_3_proxy/Student.java
new file mode 100644
index 000000000..a3148296c
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_3_proxy/Student.java
@@ -0,0 +1,26 @@
+package code._4_student_effort._3_proxy;
+
+public class Student
+{
+    private String name;
+    private int money;
+
+    public Student(String name,int money)
+    {
+        this.name=name;
+        this.money=money;
+    }
+    public Student()
+    {
+        this.name="";
+        this.money=0;
+    }
+    public String getName()
+    {
+        return name;
+    }
+    public int getMoney()
+    {
+        return money;
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/ObservedSubject.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/ObservedSubject.java
new file mode 100644
index 000000000..de8677f27
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/ObservedSubject.java
@@ -0,0 +1,8 @@
+package code._4_student_effort._4_observer;
+
+public interface ObservedSubject
+{
+    public void register(Observer obj);
+    public void unregister(Observer obj);
+    public void notifyObservers(String message);
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/Observer.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/Observer.java
new file mode 100644
index 000000000..85305c383
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/Observer.java
@@ -0,0 +1,6 @@
+package code._4_student_effort._4_observer;
+
+public interface Observer
+{
+    public void update(String message);
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/Student.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/Student.java
new file mode 100644
index 000000000..9da137f2e
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/Student.java
@@ -0,0 +1,23 @@
+package code._4_student_effort._4_observer;
+
+public class Student implements Observer
+{
+    private String name;
+
+    public Student(String m)
+    {
+        name=m;
+    }
+    public Student()
+    {
+        this("");
+    }
+    public void listenTo(Teacher t)
+    {
+        t.register(this);
+    }
+    public void update(String message)
+    {
+        System.out.println("Studentul "+name+" a invata astazi despre "+message);
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/Teacher.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/Teacher.java
new file mode 100644
index 000000000..42712452d
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/Teacher.java
@@ -0,0 +1,31 @@
+package code._4_student_effort._4_observer;
+
+import java.util.Arrays;
+
+public class Teacher implements ObservedSubject
+{
+    private Observer [] observers=new Observer[0];
+
+    public void register(Observer obj)
+    {
+        observers= Arrays.copyOf(observers, observers.length+1);
+        observers[observers.length-1]=obj;
+    }
+    public void unregister(Observer obj)
+    {
+        int removeIndex=-1;
+        for(int i=0;i<observers.length;i++)
+            if(observers[i].equals(obj))
+            {
+                removeIndex=i;
+            }
+        System.arraycopy(observers,removeIndex+1,observers,removeIndex,observers.length-removeIndex-1);
+    }
+    public void notifyObservers(String message)
+    {
+        for(int i=0;i< observers.length;i++)
+        {
+            observers[i].update((message));
+        }
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/TeachingClassExample.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/TeachingClassExample.java
new file mode 100644
index 000000000..e6d1c9077
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_4_observer/TeachingClassExample.java
@@ -0,0 +1,24 @@
+package code._4_student_effort._4_observer;
+
+public class TeachingClassExample
+{
+    public static void main(String[] args) {
+        Teacher teacher = new Teacher();
+        Student s01 = new Student("Popescu");
+        Student s02 = new Student("Ionescu");
+        Student s03 = new Student("Dragomirescu");
+
+        s01.listenTo(teacher);
+        s02.listenTo(teacher);
+        s03.listenTo(teacher);
+
+        String[] javaTopics = new String[]{
+                "basics",
+                "oo",
+                "design patterns"
+        };
+        for (int i = 0; i < javaTopics.length; i++) {
+            teacher.notifyObservers(javaTopics[i]);
+        }
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/AscBubbleSort.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/AscBubbleSort.java
new file mode 100644
index 000000000..bde0b931b
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/AscBubbleSort.java
@@ -0,0 +1,11 @@
+package code._4_student_effort._5_template_method;
+
+public class AscBubbleSort extends TemplateMethodBubbleSort
+{
+    public boolean compara(int a,int b)
+    {
+        if(a>b)
+            return true;
+        return false;
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/DescBubbleSort.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/DescBubbleSort.java
new file mode 100644
index 000000000..ebbb63b73
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/DescBubbleSort.java
@@ -0,0 +1,11 @@
+package code._4_student_effort._5_template_method;
+
+public class DescBubbleSort extends TemplateMethodBubbleSort
+{
+    public boolean compara(int a,int b)
+    {
+        if(a<b)
+            return true;
+        return false;
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/TemplateMethodBubbleSort.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/TemplateMethodBubbleSort.java
new file mode 100644
index 000000000..9067b7f1e
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/TemplateMethodBubbleSort.java
@@ -0,0 +1,18 @@
+package code._4_student_effort._5_template_method;
+
+public abstract class TemplateMethodBubbleSort
+{
+    public void sort(int [] v)
+    {
+        for(int i=0;i<v.length-1;i++)
+            for(int j=i+1;j<v.length;j++)
+                if(compara(v[i],v[j]))
+                {
+                    int aux;
+                    aux=v[i];
+                    v[i]=v[j];
+                    v[j]=aux;
+                }
+    }
+    public abstract boolean compara(int a,int b);
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/TemplateMethodExample.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/TemplateMethodExample.java
new file mode 100644
index 000000000..8f5fd1ae2
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_5_template_method/TemplateMethodExample.java
@@ -0,0 +1,26 @@
+package code._4_student_effort._5_template_method;
+
+import java.util.Arrays;
+
+public class TemplateMethodExample
+{
+    public static void main(String[] args)
+    {
+        int[] arr = new int[]{1, 4, 5, 2, 3, 6, 9, 8, 7};
+        int[] copy01OfArr = Arrays.copyOf(arr, arr.length);
+        int[] copy02OfArr = Arrays.copyOf(arr, arr.length);
+
+        AscBubbleSort asc=new AscBubbleSort();
+        asc.sort(copy01OfArr);
+        DescBubbleSort desc=new DescBubbleSort();
+        desc.sort(copy02OfArr);
+        afiseaza(copy01OfArr);
+        System.out.println();
+        afiseaza(copy02OfArr);
+    }
+    public static void afiseaza(int [] v)
+    {
+        for(int i=0;i<v.length;i++)
+            System.out.print(v[i]+" , ");
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_6_Builder/Example.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_6_Builder/Example.java
new file mode 100644
index 000000000..193b18a1d
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_6_Builder/Example.java
@@ -0,0 +1,14 @@
+package code._4_student_effort._6_Builder;
+
+public class Example
+{
+    public static void main(String[] args)
+    {
+        Person person01 = new Person.Builder("Popescu")
+                .setJob("java developer")
+                .setUniversity("FMI")
+                .setMarried(false)
+                .build();
+
+    }
+}
diff --git a/_3_design_patterns/src/main/java/code/_4_student_effort/_6_Builder/Person.java b/_3_design_patterns/src/main/java/code/_4_student_effort/_6_Builder/Person.java
new file mode 100644
index 000000000..c95f4f833
--- /dev/null
+++ b/_3_design_patterns/src/main/java/code/_4_student_effort/_6_Builder/Person.java
@@ -0,0 +1,52 @@
+package code._4_student_effort._6_Builder;
+
+public class Person
+{
+    private String nume;
+    private String job;
+    private String university;
+    private String drivingLicense;
+    private boolean isMarried;
+
+    public Person(Builder builder)
+    {
+        nume=builder.nume;
+        job=builder.job;
+        university=builder.university;
+        drivingLicense=builder.drivingLicense;
+        isMarried=builder.isMarried;
+    }
+    public static class Builder
+    {
+        private final String nume;
+        private String job;
+        private String university;
+        private String drivingLicense;
+        private boolean isMarried;
+
+        public Builder(String name)
+        {
+            nume=name;
+        }
+        public void setJob(String j)
+        {
+            job=j;
+        }
+        public void setUniversity(String u)
+        {
+            university=u;
+        }
+        public void setDrivingLicense(String d)
+        {
+            drivingLicense=d;
+        }
+        public void setMarried(Boolean ok)
+        {
+            isMarried=ok;
+        }
+        public Person build()
+        {
+            return new Person(this);
+        }
+    }
+}
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diff --git a/_3_design_patterns/src/main/out/production/main/code/_4_student_effort/_5_template_method/TemplateMethodExample.class b/_3_design_patterns/src/main/out/production/main/code/_4_student_effort/_5_template_method/TemplateMethodExample.class
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diff --git a/_3_design_patterns/src/main/out/production/main/code/_4_student_effort/_6_Builder/Person$Builder.class b/_3_design_patterns/src/main/out/production/main/code/_4_student_effort/_6_Builder/Person$Builder.class
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index 000000000..21674a0e9
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diff --git a/_3_design_patterns/src/main/out/production/main/code/_4_student_effort/_6_Builder/Person.class b/_3_design_patterns/src/main/out/production/main/code/_4_student_effort/_6_Builder/Person.class
new file mode 100644
index 000000000..8fde3105e
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diff --git a/_4_exceptions_io/src/main/java/code/_4_student_effort/_1_Phone_Book/PhoneBook.java b/_4_exceptions_io/src/main/java/code/_4_student_effort/_1_Phone_Book/PhoneBook.java
new file mode 100644
index 000000000..de9c141be
--- /dev/null
+++ b/_4_exceptions_io/src/main/java/code/_4_student_effort/_1_Phone_Book/PhoneBook.java
@@ -0,0 +1,24 @@
+package code._4_student_effort._1_Phone_Book;
+
+import java.io.BufferedReader;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.util.Scanner;
+
+public class PhoneBook
+{
+    public static void main(String[] args)
+    {
+        String cautat="abc";
+        try{
+            readPhoneBook("Fisier");
+        }catch (FileNotFoundException e)
+        {
+            e.printStackTrace();
+        }
+    }
+    public static void readPhoneBook(String file) throws FileNotFoundException
+    {
+        Scanner s = new Scanner(new BufferedReader(new FileReader(file)));
+    }
+}
diff --git a/_4_exceptions_io/src/main/java/code/_4_student_effort/_2_incercare/Array.java b/_4_exceptions_io/src/main/java/code/_4_student_effort/_2_incercare/Array.java
new file mode 100644
index 000000000..0efed36be
--- /dev/null
+++ b/_4_exceptions_io/src/main/java/code/_4_student_effort/_2_incercare/Array.java
@@ -0,0 +1,20 @@
+package code._4_student_effort._2_incercare;
+
+public class Array {
+    public static void main(String[] args) {
+        try {
+            int[] v = new int[]{1, 2, 3};
+            citireArray(v);
+        } catch (ArrayIndexOutOfBoundsException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void citireArray(int[] v) throws ArrayIndexOutOfBoundsException {
+        try {
+            System.out.println(v[v.length + 1]);
+        } finally {
+            System.out.println("degeaba");
+        }
+    }
+}
diff --git a/_4_exceptions_io/src/main/java/code/_4_student_effort/_2_incercare/Incercare.java b/_4_exceptions_io/src/main/java/code/_4_student_effort/_2_incercare/Incercare.java
new file mode 100644
index 000000000..3c1d2272d
--- /dev/null
+++ b/_4_exceptions_io/src/main/java/code/_4_student_effort/_2_incercare/Incercare.java
@@ -0,0 +1,11 @@
+package code._4_student_effort._2_incercare;
+
+public class Incercare
+{
+    public static void main(String[] args)
+    {
+
+        int []v=new int[]{1,2,3};
+        System.out.println(v[3]);
+    }
+}
diff --git a/_4_exceptions_io/src/main/java/code/_4_student_effort/_2_incercare/SecretMessage.java b/_4_exceptions_io/src/main/java/code/_4_student_effort/_2_incercare/SecretMessage.java
new file mode 100644
index 000000000..2e62ae7ac
--- /dev/null
+++ b/_4_exceptions_io/src/main/java/code/_4_student_effort/_2_incercare/SecretMessage.java
@@ -0,0 +1,24 @@
+package code._4_student_effort._2_incercare;
+
+import java.io.BufferedReader;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.util.Scanner;
+
+public class SecretMessage
+{
+    public static void main(String[] args)
+    {
+        try
+        {
+            Citire("Fisier");
+        } catch (FileNotFoundException e)
+        {
+            e.printStackTrace();
+        }
+    }
+    public static void Citire(String file) throws FileNotFoundException
+    {
+        Scanner s = new Scanner(new BufferedReader(new FileReader(file)));
+    }
+}
diff --git a/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/GenericLinkedListChallenge.java b/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/GenericLinkedListChallenge.java
index bff2e8a3a..152337647 100644
--- a/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/GenericLinkedListChallenge.java
+++ b/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/GenericLinkedListChallenge.java
@@ -4,12 +4,12 @@ public class GenericLinkedListChallenge {
 
     public static void main(String[] args) {
         String rootValue = "a";
-        GenericList<String> list = new GenericList<>(rootValue);
+      /*  GenericList<String> list = new GenericList<>(rootValue);
 
         for (int i = 1; i < 10; i++) {
             list.insert(String.valueOf(Character.valueOf((char) (rootValue.charAt(0) + i))));
         }
-        list.println();
+        list.println();*/
 
     }
 }
diff --git a/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/GenericList.java b/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/GenericList.java
index 7a5075a7e..bf794bd2d 100644
--- a/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/GenericList.java
+++ b/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/GenericList.java
@@ -4,9 +4,10 @@ public class GenericList<T> implements IGenericList<T> {
 
     private IGenericNode<T> root;
 
-    public GenericList(T rootValue) {
+    public GenericList( IGenericNode<T> root1) {
         this.root = new GenericNode<>();
-        this.root.setValue(rootValue);
+        this.root.setValue(root1.getValue());
+        this.root.setNext(root1.getNext());
     }
 
     @Override
diff --git a/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/IGenericList.java b/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/IGenericList.java
index 996b41e0c..aea376644 100644
--- a/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/IGenericList.java
+++ b/_5_generics/src/main/java/code/_2_challenge/_3_generic_linked_list/IGenericList.java
@@ -1,7 +1,11 @@
 package code._2_challenge._3_generic_linked_list;
 
+import code._4_student_effort._4_genericc_iterator.IGenericNode;
+
 public interface IGenericList<T> {
     void insert(T element);
 
     void println();
+
+    IGenericNode<T> getRoot();
 }
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/Currency.java b/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/Currency.java
new file mode 100644
index 000000000..848f61f7a
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/Currency.java
@@ -0,0 +1,24 @@
+package code._4_student_effort._1_exchange_desk;
+
+public abstract class Currency
+{
+    private double units;
+
+    public Currency()
+    {
+        units=0;
+    }
+    public Currency(double units)
+    {
+        this.units=units;
+    }
+    public void setUnits(double units)
+    {
+        this.units=units;
+    }
+    public double getUnits()
+    {
+        return units;
+    }
+
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/ExchangeDesk.java b/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/ExchangeDesk.java
new file mode 100644
index 000000000..918f5d614
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/ExchangeDesk.java
@@ -0,0 +1,6 @@
+package code._4_student_effort._1_exchange_desk;
+
+public class ExchangeDesk
+{
+
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/Ron.java b/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/Ron.java
new file mode 100644
index 000000000..21b936d1d
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/Ron.java
@@ -0,0 +1,27 @@
+package code._4_student_effort._1_exchange_desk;
+
+public class Ron extends Currency
+{
+    public Ron()
+    {
+        super();
+    }
+    public Ron(double units)
+    {
+        super(units);
+    }
+
+    @Override
+    public void setUnits(double units)
+    {
+        super.setUnits(units);
+    }
+    public double getUnits()
+    {
+        return super.getUnits();
+    }
+    public String toString()
+    {
+        return this.getUnits()+"lei";
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/USD.java b/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/USD.java
new file mode 100644
index 000000000..ac7538052
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_1_exchange_desk/USD.java
@@ -0,0 +1,21 @@
+package code._4_student_effort._1_exchange_desk;
+
+public class USD extends Currency
+{
+    public USD()
+    {
+        super();
+    }
+    public USD(double units)
+    {
+        super(units);
+    }
+    public void setUnits(double units)
+    {
+        super.setUnits(units);
+    }
+    public String toString()
+    {
+        return getUnits()+"USD";
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Boot.java b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Boot.java
new file mode 100644
index 000000000..0465b986c
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Boot.java
@@ -0,0 +1,26 @@
+package code._4_student_effort._2_pairss;
+
+public class Boot implements Shoe
+{
+    private double size;
+    private String color;
+
+    public Boot(double size,String color)
+    {
+        this.size=size;
+        this.color=color;
+    }
+    public Boot()
+    {
+        this(0,"");
+    }
+    public double getSize()
+    {
+        return size;
+    }
+    public String getColor()
+    {
+        return color;
+    }
+
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/ColorDoesNotMatchException.java b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/ColorDoesNotMatchException.java
new file mode 100644
index 000000000..3c7bd46df
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/ColorDoesNotMatchException.java
@@ -0,0 +1,9 @@
+package code._4_student_effort._2_pairss;
+
+public class ColorDoesNotMatchException extends RuntimeException
+{
+    public ColorDoesNotMatchException(String message)
+    {
+        super(message);
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Heels.java b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Heels.java
new file mode 100644
index 000000000..764bb6dbd
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Heels.java
@@ -0,0 +1,25 @@
+package code._4_student_effort._2_pairss;
+
+public class Heels implements Shoe
+{
+    private double size;
+    private String color;
+
+    public Heels(double size,String color)
+    {
+        this.size=size;
+        this.color=color;
+    }
+    public Heels()
+    {
+        this(0,"");
+    }
+    public double getSize()
+    {
+        return size;
+    }
+    public String getColor()
+    {
+        return color;
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Pair.java b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Pair.java
new file mode 100644
index 000000000..9cfe711a3
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Pair.java
@@ -0,0 +1,31 @@
+package code._4_student_effort._2_pairss;
+
+import java.awt.*;
+
+public class Pair <T extends Shoe>
+{
+    private T firstObject;
+    private T secondObject;
+
+    public Pair(T firstObject,T secondObject)
+    {
+        this.firstObject=firstObject;
+        this.secondObject=secondObject;
+        this.match(firstObject,secondObject);
+    }
+    public void match(T firstObject,T secondObject)
+    {
+        if(!firstObject.getColor().equals(secondObject.getColor()))
+            throw new SizeDoNotMatchException("Size do not martch!");
+        if(firstObject.getSize()!=secondObject.getSize())
+            throw new ColorDoesNotMatchException("Color does not match!");
+    }
+    public T getFirstObject()
+    {
+        return firstObject;
+    }
+    public T getSecondObject()
+    {
+        return secondObject;
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/RunnableClass.java b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/RunnableClass.java
new file mode 100644
index 000000000..2fb561284
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/RunnableClass.java
@@ -0,0 +1,19 @@
+package code._4_student_effort._2_pairss;
+
+public class RunnableClass
+{
+    public static void main(String[] args) {
+        Running runningShoe1 = new Running(41, "RED");
+        Running runningShoe2 = new Running(41, "RED");
+        Pair<Running> pairOK = new Pair<>(runningShoe1, runningShoe2);
+
+        Boot bootShoe = new Boot(45, "BLACK");
+        //Pair<Running> pairNotOK = new Pair<>(runningShoe1, bootShoe);
+
+
+        Running runningShoe3 = new Running(41, "RED");
+        Running runningShoe4 = new Running(42, "RED");
+        Pair<Running> pair1 = new Pair<>(runningShoe3, runningShoe4);
+
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Running.java b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Running.java
new file mode 100644
index 000000000..e059aff71
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Running.java
@@ -0,0 +1,26 @@
+package code._4_student_effort._2_pairss;
+
+public class Running implements Shoe
+{
+    private double size;
+    private String color;
+
+    public Running(double size,String color)
+    {
+        this.size=size;
+        this.color=color;
+    }
+
+    public Running()
+    {
+        this(0,"");
+    }
+    public double getSize()
+    {
+        return size;
+    }
+    public String getColor()
+    {
+        return color;
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Shoe.java b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Shoe.java
new file mode 100644
index 000000000..7cbaf6a8a
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/Shoe.java
@@ -0,0 +1,7 @@
+package code._4_student_effort._2_pairss;
+
+public interface Shoe
+{
+    public double getSize();
+    public String getColor();
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/SizeDoNotMatchException.java b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/SizeDoNotMatchException.java
new file mode 100644
index 000000000..c743f9f31
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_2_pairss/SizeDoNotMatchException.java
@@ -0,0 +1,9 @@
+package code._4_student_effort._2_pairss;
+
+public class SizeDoNotMatchException extends RuntimeException
+{
+    public SizeDoNotMatchException(String message)
+    {
+        super(message);
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/Example.java b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/Example.java
new file mode 100644
index 000000000..932367032
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/Example.java
@@ -0,0 +1,18 @@
+package code._4_student_effort._3_genericc_linked_list;
+
+public class Example
+{
+    public static void main(String[] args)
+    {
+        IGenericNode<Integer> node=new GenericNode<Integer>();
+        node.setValue(1);
+        node.setNext(null);
+        IGenericList<Integer> list=new GenericList<Integer>(node);
+        IGenericNode<Integer> node2=new GenericNode<Integer>();
+        node.setValue(2);
+      //  node2.setNext(null);
+        list.insert(node2);
+        list.println();
+
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/GenericList.java b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/GenericList.java
new file mode 100644
index 000000000..bd9ac4bbf
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/GenericList.java
@@ -0,0 +1,37 @@
+package code._4_student_effort._3_genericc_linked_list;
+
+public class GenericList<T> implements IGenericList<T>
+{
+    private IGenericNode<T> root;
+
+    public GenericList(IGenericNode<T> node)
+    {
+        root.setValue(node.getValue());
+        root.setNext(node.getNext());
+    }
+    public void insert(IGenericNode<T> node)
+    {
+        IGenericNode<T> cursor=root;
+        while(cursor.getNext()!=null)
+        {
+            cursor=cursor.getNext();
+        }
+        IGenericNode<T> aux=new GenericNode<T>();
+        aux.setValue(node.getValue());
+        aux.setNext(null);
+        cursor.setNext(aux);
+    }
+    public void println()
+    {
+        IGenericNode<T> cursor=root;
+        while(cursor.getNext()!=null)
+        {
+            System.out.println(cursor.getValue());
+            cursor=cursor.getNext();
+        }
+    }
+    public IGenericNode<T> getRoot()
+    {
+        return root;
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/GenericNode.java b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/GenericNode.java
new file mode 100644
index 000000000..19c907092
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/GenericNode.java
@@ -0,0 +1,24 @@
+package code._4_student_effort._3_genericc_linked_list;
+
+public class GenericNode<T> implements IGenericNode<T>
+{
+    private T value;
+    private IGenericNode<T> next;
+
+    public T getValue()
+    {
+        return value;
+    }
+    public IGenericNode<T> getNext()
+    {
+        return next;
+    }
+    public void setValue(T value)
+    {
+        this.value=value;
+    }
+    public void setNext(IGenericNode<T> next)
+    {
+        this.next=next;
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/IGenericList.java b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/IGenericList.java
new file mode 100644
index 000000000..66f889a98
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/IGenericList.java
@@ -0,0 +1,8 @@
+package code._4_student_effort._3_genericc_linked_list;
+
+public interface IGenericList<T>
+{
+    public void insert(IGenericNode<T> node);
+    public void println();
+    public IGenericNode<T> getRoot();
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/IGenericNode.java b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/IGenericNode.java
new file mode 100644
index 000000000..5a52b7b97
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_3_genericc_linked_list/IGenericNode.java
@@ -0,0 +1,10 @@
+package code._4_student_effort._3_genericc_linked_list;
+
+public interface IGenericNode<T>
+{
+    public T getValue();
+    public void setValue(T value);
+    public IGenericNode<T> getNext();
+    public void setNext(IGenericNode<T> next);
+
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/ArrayIterator.java b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/ArrayIterator.java
new file mode 100644
index 000000000..b3d196def
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/ArrayIterator.java
@@ -0,0 +1,28 @@
+package code._4_student_effort._4_genericc_iterator;
+
+import java.lang.reflect.Array;
+
+public class ArrayIterator<T> implements IArrayIterator<T>
+{
+    private Integer index;
+    private T [] array;
+
+    public ArrayIterator(T [] array)
+    {
+        index=0;
+        this.array=array;
+    }
+
+    @Override
+    public boolean hasNext()
+    {
+        if(index< array.length)
+            return true;
+        else
+            return false;
+    }
+    public T next()
+    {
+        return array[index++];
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/Example1.java b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/Example1.java
new file mode 100644
index 000000000..fb79284bc
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/Example1.java
@@ -0,0 +1,16 @@
+package code._4_student_effort._4_genericc_iterator;
+
+public class Example1
+{
+    public static void main(String[] args)
+    {
+        Integer [] arr1=new Integer[4];
+        arr1[0]=0;
+        arr1[1]=1;
+        arr1[2]=2;
+        arr1[3]=3;
+        IArrayIterator<Integer> it=new ArrayIterator<Integer>(arr1);
+        while(it.hasNext())
+            System.out.println(it.next());
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/GenericList.java b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/GenericList.java
new file mode 100644
index 000000000..72165132d
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/GenericList.java
@@ -0,0 +1,37 @@
+package code._4_student_effort._3_genericc_linked_list;
+
+public class GenericList<T> implements IGenericList<T>
+{
+    private IGenericNode<T> root;
+
+    public GenericList(IGenericNode<T> node)
+    {
+        root.setValue(node.getValue());
+        root.setNext(node.getNext());
+    }
+    public void insert(IGenericNode<T> node)
+    {
+        IGenericNode<T> cursor=root;
+        while(cursor.getNext()!=null)
+        {
+            cursor=cursor.getNext();
+        }
+        IGenericNode<T> aux=new GenericNode<T>();
+        aux.setValue(node.getValue());
+        aux.setNext(null);
+        cursor.setNext(aux);
+    }
+    public void println()
+    {
+        IGenericNode<T> cursor=root;
+        while(cursor.getNext()!=null)
+        {
+            System.out.println(cursor.getValue());
+            cursor=cursor.getNext();
+        }
+    }
+    public code._4_student_effort._4_genericc_iterator.IGenericNode<T> getRoot()
+    {
+        return root;
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/GenericNode.java b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/GenericNode.java
new file mode 100644
index 000000000..19c907092
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/GenericNode.java
@@ -0,0 +1,24 @@
+package code._4_student_effort._3_genericc_linked_list;
+
+public class GenericNode<T> implements IGenericNode<T>
+{
+    private T value;
+    private IGenericNode<T> next;
+
+    public T getValue()
+    {
+        return value;
+    }
+    public IGenericNode<T> getNext()
+    {
+        return next;
+    }
+    public void setValue(T value)
+    {
+        this.value=value;
+    }
+    public void setNext(IGenericNode<T> next)
+    {
+        this.next=next;
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/IArrayIterator.java b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/IArrayIterator.java
new file mode 100644
index 000000000..08992ce4d
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/IArrayIterator.java
@@ -0,0 +1,7 @@
+package code._4_student_effort._4_genericc_iterator;
+
+public interface IArrayIterator<T>
+{
+    public T next();
+    public boolean hasNext();
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/IGenericList.java b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/IGenericList.java
new file mode 100644
index 000000000..a34b6bc63
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/IGenericList.java
@@ -0,0 +1,8 @@
+package code._4_student_effort._3_genericc_linked_list;
+
+public interface IGenericList<T>
+{
+    public void insert(IGenericNode<T> node);
+    public void println();
+    public code._4_student_effort._4_genericc_iterator.IGenericNode<T> getRoot();
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/IGenericNode.java b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/IGenericNode.java
new file mode 100644
index 000000000..dfa92dcce
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/IGenericNode.java
@@ -0,0 +1,10 @@
+package code._4_student_effort._4_genericc_iterator;
+
+public interface IGenericNode<T>
+{
+    public T getValue();
+    public void setValue(T value);
+    public IGenericNode<T> getNext();
+    public void setNext(IGenericNode<T> next);
+
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/ListIterator.java b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/ListIterator.java
new file mode 100644
index 000000000..88aa3b0d2
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_4_genericc_iterator/ListIterator.java
@@ -0,0 +1,29 @@
+package code._4_student_effort._4_genericc_iterator;
+
+import code._2_challenge._3_generic_linked_list.IGenericList;
+import code._4_student_effort._3_genericc_linked_list.GenericList;
+import code._4_student_effort._3_genericc_linked_list.GenericNode;
+
+public class ListIterator<T> implements IArrayIterator<T>
+{
+    IGenericNode<T> cursor;
+    IGenericList<T> list;
+
+    public ListIterator(IGenericList list1)
+    {
+        list=list1;
+        cursor=list.getRoot();
+    }
+    public boolean hasNext()
+    {
+        cursor=cursor.getNext();
+        if(cursor!=null)
+            return true;
+        else
+            return false;
+    }
+    public T next()
+    {
+        return cursor.getValue();
+    }
+}
diff --git a/_5_generics/src/main/java/code/_4_student_effort/_5_genericc_binary_search/Main.java b/_5_generics/src/main/java/code/_4_student_effort/_5_genericc_binary_search/Main.java
new file mode 100644
index 000000000..8144bdfd0
--- /dev/null
+++ b/_5_generics/src/main/java/code/_4_student_effort/_5_genericc_binary_search/Main.java
@@ -0,0 +1,20 @@
+package code._4_student_effort._5_genericc_binary_search;
+
+public class Main
+{
+    public static void main(String[] args)
+    {
+        Integer [] v=new Integer[10];
+        v[0]=1;
+        v[1]=2;
+        v[2]=3;
+        v[3]=4;
+        v[4]=5;
+        v[5]=6;
+        v[6]=7;
+        v[7]=8;
+        v[8]=9;
+        v[9]=10;
+    }
+    public static T
+}
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diff --git a/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_3_genericc_linked_list/Example.class b/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_3_genericc_linked_list/Example.class
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diff --git a/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_3_genericc_linked_list/GenericList.class b/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_3_genericc_linked_list/GenericList.class
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diff --git a/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_3_genericc_linked_list/GenericNode.class b/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_3_genericc_linked_list/GenericNode.class
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diff --git a/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_3_genericc_linked_list/IGenericList.class b/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_3_genericc_linked_list/IGenericList.class
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diff --git a/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_4_genericc_iterator/ArrayIterator.class b/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_4_genericc_iterator/ArrayIterator.class
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diff --git a/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_4_genericc_iterator/Example1.class b/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_4_genericc_iterator/Example1.class
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diff --git a/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_4_genericc_iterator/IArrayIterator.class b/_5_generics/src/main/java/code/out/production/code/code/_4_student_effort/_4_genericc_iterator/IArrayIterator.class
new file mode 100644
index 000000000..05f8ad4db
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diff --git a/_6_collections/src/main/java/code/_4_student_effort/_1_lleaders/LeadersChalllenge.java b/_6_collections/src/main/java/code/_4_student_effort/_1_lleaders/LeadersChalllenge.java
new file mode 100644
index 000000000..d3e3dcc4f
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_1_lleaders/LeadersChalllenge.java
@@ -0,0 +1,35 @@
+package code._4_student_effort._1_lleaders;
+
+import java.util.*;
+
+public class LeadersChalllenge
+{
+    public static void main(String[] args)
+    {
+        List<Integer> list = Arrays.asList(3, 5, 9, 2, 4, 8, 7, 6); //9,8,7,6 are leaders
+        findLeaders(list);
+        List<Integer> leadersList=new ArrayList<>();
+        leadersList=findLeaders(list);
+        afisare(leadersList);
+    }
+    public static List<Integer> findLeaders(List<Integer> list)
+    {
+        List<Integer> leadersList=new ArrayList<>();
+        for(int i=0;i< list.size();i++)
+        {
+            boolean isLeader=true;
+            for(int j=i+1;j<list.size();j++)
+                if(list.get(i)<list.get(j))
+                    isLeader=false;
+            if(isLeader)
+                leadersList.add(list.get(i));
+        }
+        return leadersList;
+    }
+    public static void afisare(List<Integer> list)
+    {
+        ListIterator<Integer> iterator1= list.listIterator();
+        while(iterator1.hasNext())
+            System.out.println(iterator1.next()+" is a leader");
+    }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_2_pascall_triangle/PascalTriangleChallenge.java b/_6_collections/src/main/java/code/_4_student_effort/_2_pascall_triangle/PascalTriangleChallenge.java
new file mode 100644
index 000000000..460d73f0b
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_2_pascall_triangle/PascalTriangleChallenge.java
@@ -0,0 +1,46 @@
+package code._4_student_effort._2_pascall_triangle;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class PascalTriangleChallenge
+{
+    public static void main(String[] args)
+    {
+        List<List<Integer>> list=generatePascalTriangle(8);
+        afisare(list);
+
+    }
+    public static List<List<Integer>> generatePascalTriangle(int n)
+    {
+        List<List<Integer>> triangle=new ArrayList<>();
+        for(int i=0;i<n;i++)
+        {
+            triangle.add(new ArrayList<>());
+            triangle.get(i).add(1);
+            if((i!=0)&&(i!=1))
+            {
+                if (triangle.get(i - 1).size() >= 2)
+                {
+                    for (int k = 0; k < triangle.get(i - 1).size() - 1; k++)
+                    {
+                        Integer sum = triangle.get(i - 1).get(k) + triangle.get(i - 1).get(k + 1);
+                        triangle.get(i).add(sum);
+                    }
+                }
+            }
+            if(i!=0)
+                triangle.get(i).add(1);
+        }
+        return triangle;
+    }
+    public static void afisare(List<List<Integer>> list)
+    {
+        for(int i=0;i<list.size();i++)
+        {
+            for (int j = 0; j < list.get(i).size(); j++)
+                System.out.print(list.get(i).get(j) + "  ");
+            System.out.println("");
+        }
+    }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_3_bell_triangle/BellTriangleChallenge.java b/_6_collections/src/main/java/code/_4_student_effort/_3_bell_triangle/BellTriangleChallenge.java
new file mode 100644
index 000000000..99794cc37
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_3_bell_triangle/BellTriangleChallenge.java
@@ -0,0 +1,43 @@
+package code._4_student_effort._3_bell_triangle;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class BellTriangleChallenge
+{
+    public static void main(String[] args)
+    {
+        List<List<Integer>> list=generateBellTriangle(5);
+        afisare(list);
+    }
+    public static List<List<Integer>> generateBellTriangle(Integer n)
+    {
+        List<List<Integer>> triangle=new ArrayList<>();
+        for(int i=0;i<n;i++)
+        {
+            triangle.add(new ArrayList<>());
+            if (i == 0)
+                triangle.get(i).add(1);
+            if(i!=0)
+            {
+                triangle.get(i).add(triangle.get(i-1).get(triangle.get(i-1).size()-1));
+                for(int j=0;j<triangle.get(i-1).size();j++)
+                {
+                    Integer sum;
+                    sum=triangle.get(i-1).get(j)+triangle.get(i).get(j);
+                    triangle.get(i).add(sum);
+                }
+            }
+        }
+        return triangle;
+    }
+    public static void afisare(List<List<Integer>> list)
+    {
+        for(int i=0;i<list.size();i++)
+        {
+            for(int j=0;j<list.get(i).size();j++)
+                System.out.print(list.get(i).get(j)+"  ");
+            System.out.println("");
+        }
+        }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_5_merge_sorted_list/MergeSortedLists.java b/_6_collections/src/main/java/code/_4_student_effort/_5_merge_sorted_list/MergeSortedLists.java
new file mode 100644
index 000000000..d16609722
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_5_merge_sorted_list/MergeSortedLists.java
@@ -0,0 +1,53 @@
+package code._4_student_effort._5_merge_sorted_list;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static java.util.Arrays.asList;
+
+public class MergeSortedLists
+{
+    public static void main(String[] args)
+    {
+        List<Integer> list1 = asList(1, 2, 3, 4, 5,12,13,13);
+        List<Integer> list2 = asList(3, 4, 5, 6, 7, 8, 9, 10,11,23);
+        List<Integer> list3 = mergeSortedLists(list1,list2);
+        afisare(list3);
+    }
+    public static List<Integer> mergeSortedLists(List<Integer> list1,List<Integer> list2)
+    {
+        List<Integer> list=new ArrayList<>();
+        Integer index1=0;
+        Integer index2=0;
+        while(list.size()!=list1.size()+list2.size() && index1!=list1.size() && index2!=list2.size())
+        {
+            if(list1.get(index1)<list2.get(index2))
+            {
+                list.add(list1.get(index1));
+                index1++;
+            }
+            else
+            {
+                list.add(list2.get(index2));
+                index2++;
+            }
+        }
+        System.out.println(index1+" "+index2);
+        if(index1==list1.size())
+        {
+            for(int j=index2;j<list2.size();j++)
+                list.add(list2.get(j));
+        }
+        if(index2==list2.size())
+        {
+            for(int j=index1;j<list1.size();j++)
+                list.add(list2.get(j));
+        }
+        return list;
+    }
+    public static void afisare(List<Integer> list)
+    {
+        for(int i=0;i<list.size();i++)
+            System.out.print(list.get(i)+" , ");
+    }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_6_package_spiral/MatrixSpiral.java b/_6_collections/src/main/java/code/_4_student_effort/_6_package_spiral/MatrixSpiral.java
new file mode 100644
index 000000000..5952f4625
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_6_package_spiral/MatrixSpiral.java
@@ -0,0 +1,60 @@
+package code._4_student_effort._6_package_spiral;
+
+public class MatrixSpiral
+{
+    public static void main(String[] args)
+    {
+        Integer [][]v=new Integer[4][4];
+        v[0][0]=0;
+        v[0][1]=1;
+        v[0][2]=2;
+        v[0][3]=3;
+        v[1][0]=4;
+        v[1][1]=5;
+        v[1][2]=6;
+        v[1][3]=7;
+        v[2][0]=8;
+        v[2][1]=9;
+        v[2][2]=10;
+        v[2][3]=11;
+        v[3][0]=12;
+        v[3][1]=13;
+        v[3][2]=14;
+        v[3][3]=15;
+        afisareNormala(v);
+        System.out.println("-------------------");
+        afisareSpirala(v);
+    }
+    public static void afisareSpirala(Integer [][] v)
+    {
+        boolean ok=true;
+        Integer n=v.length;
+        Integer index=0;
+        while(ok)
+        {
+            ok=false;
+            for(int j=index;j<n-index;j++)
+            {System.out.print(v[index][j]+" ");
+                ok=true;}
+            for(int i=index+1;i<n-index-1;i++)
+            { System.out.print(v[i][n-index-1]+" ");
+                ok=true;}
+            for(int j=n-index-1;j>=index;j--)
+            {System.out.print(v[n-index-1][j]+" ");
+                ok=true;}
+            for(int i=n-index-2;i>=index+1;i--)
+            {System.out.print(v[i][index]+" ");
+                ok=true;}
+            index++;
+        }
+    }
+    public static void afisareNormala(Integer [][] v)
+    {
+        for(int i=0;i<v.length;i++)
+        {
+            for(int j=0;j<v.length;j++)
+                System.out.print(v[i][j]+ " ");
+            System.out.println("");
+        }
+    }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_7_my_hashhtable/Challenge.java b/_6_collections/src/main/java/code/_4_student_effort/_7_my_hashhtable/Challenge.java
new file mode 100644
index 000000000..ada91443b
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_7_my_hashhtable/Challenge.java
@@ -0,0 +1,26 @@
+package code._4_student_effort._7_my_hashhtable;
+
+public class Challenge <K,V>
+{
+    public static void main(String[] args)
+    {
+        MyHashhTable<Integer,String> map=new MyHashhTableImpl<Integer,String>();
+        map=createMap();
+        afisare(map);
+    }
+    public static MyHashhTable<Integer,String> createMap()
+    {
+        Integer[] a=new Integer[]{1,2,3};
+        String[] s=new String[]{"unu","doi","trei"};
+        MyHashhTable<Integer,String> map=new MyHashhTableImpl<Integer,String>();
+        map.put(a[0],s[0]);
+        map.put(a[1],s[1]);
+        map.put(a[2],s[2]);
+        return map;
+    }
+    public static void afisare(MyHashhTable<Integer,String> map)
+    {
+        for(int i=0;i<map.size();i++)
+            System.out.println(map.get(i+1));
+    }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_7_my_hashhtable/MyHashhTable.java b/_6_collections/src/main/java/code/_4_student_effort/_7_my_hashhtable/MyHashhTable.java
new file mode 100644
index 000000000..971fca251
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_7_my_hashhtable/MyHashhTable.java
@@ -0,0 +1,10 @@
+package code._4_student_effort._7_my_hashhtable;
+
+public interface MyHashhTable<K,V>
+{
+    public V get(K key);
+    public void put(K key, V value);
+    public void remove(K key);
+    public boolean containsKey(K key);
+    public int size();
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_7_my_hashhtable/MyHashhTableImpl.java b/_6_collections/src/main/java/code/_4_student_effort/_7_my_hashhtable/MyHashhTableImpl.java
new file mode 100644
index 000000000..9c3283c53
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_7_my_hashhtable/MyHashhTableImpl.java
@@ -0,0 +1,32 @@
+package code._4_student_effort._7_my_hashhtable;
+
+public class MyHashhTableImpl<K,V> implements MyHashhTable<K,V>
+{
+    private Object[] values = new Object[Integer.MAX_VALUE / 100];
+    private int nrOfElements = 0;
+
+    public V get(K key)
+    {
+        return (V) values[key.hashCode()];
+    }
+    public void put(K key, V value)
+    {
+        values[key.hashCode()]=value;
+        nrOfElements++;
+    }
+    public void remove(K key)
+    {
+        values[key.hashCode()]=null;
+    }
+    public boolean containsKey(K key)
+    {
+        if(values[key.hashCode()]!=null)
+            return true;
+        else
+            return true;
+    }
+    public int size()
+    {
+        return nrOfElements;
+    }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_8_My_ArrayList/Challenge.java b/_6_collections/src/main/java/code/_4_student_effort/_8_My_ArrayList/Challenge.java
new file mode 100644
index 000000000..ec44d7ce5
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_8_My_ArrayList/Challenge.java
@@ -0,0 +1,17 @@
+package code._4_student_effort._8_My_ArrayList;
+
+public class Challenge
+{
+    public static void main(String[] args)
+    {
+        MyArrayList<Integer> list=new MyArrayListImpl<Integer>();
+        list.add(1);
+        list.add(2);
+        list.add(3);
+        list.set(1,0);
+        for(int i=0;i<list.size();i++)
+        {
+            System.out.print(list.get(i)+ "  ");
+        }
+    }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_8_My_ArrayList/MyArrayList.java b/_6_collections/src/main/java/code/_4_student_effort/_8_My_ArrayList/MyArrayList.java
new file mode 100644
index 000000000..a20bbc0e0
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_8_My_ArrayList/MyArrayList.java
@@ -0,0 +1,10 @@
+package code._4_student_effort._8_My_ArrayList;
+
+public interface MyArrayList<T>
+{
+    public void add(T e);
+    public void remove(T e);
+    public T get(int index);
+    public void set(int index,T e);
+    public int size();
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_8_My_ArrayList/MyArrayListImpl.java b/_6_collections/src/main/java/code/_4_student_effort/_8_My_ArrayList/MyArrayListImpl.java
new file mode 100644
index 000000000..daeaf69c9
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_8_My_ArrayList/MyArrayListImpl.java
@@ -0,0 +1,36 @@
+package code._4_student_effort._8_My_ArrayList;
+
+import java.util.Arrays;
+
+public class MyArrayListImpl<T> implements MyArrayList<T>
+{
+    private Object[] list=new Object[0];
+
+    public void add(T e)
+    {
+        list= Arrays.copyOf(list,list.length+1);
+        list[list.length-1]=e;
+    }
+    public void remove(T e)
+    {
+        for(int i=0;i<list.length;i++)
+        {
+            if(list[i].equals(e))
+            {
+                System.arraycopy(list,i+1,list,i,list.length-i-1);
+            }
+        }
+    }
+    public T get(int index)
+    {
+        return (T) list[index];
+    }
+    public void set(int index,T e)
+    {
+        list[index]=e;
+    }
+    public int size()
+    {
+        return list.length;
+    }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_9_My_Set/Challenge.java b/_6_collections/src/main/java/code/_4_student_effort/_9_My_Set/Challenge.java
new file mode 100644
index 000000000..f06573c3f
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_9_My_Set/Challenge.java
@@ -0,0 +1,9 @@
+package code._4_student_effort._9_My_Set;
+
+public class Challenge
+{
+    public static void main(String[] args)
+    {
+
+    }
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_9_My_Set/MySet.java b/_6_collections/src/main/java/code/_4_student_effort/_9_My_Set/MySet.java
new file mode 100644
index 000000000..7d6456029
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_9_My_Set/MySet.java
@@ -0,0 +1,11 @@
+package code._4_student_effort._9_My_Set;
+
+public interface MySet<T>
+{
+    public void add(T e);
+    public void remove(T e);
+    public T get(int index);
+    public void set(int index,T e);
+    public int size();
+    public boolean contains(T e);
+}
diff --git a/_6_collections/src/main/java/code/_4_student_effort/_9_My_Set/MySetImpl.java b/_6_collections/src/main/java/code/_4_student_effort/_9_My_Set/MySetImpl.java
new file mode 100644
index 000000000..327dffcd7
--- /dev/null
+++ b/_6_collections/src/main/java/code/_4_student_effort/_9_My_Set/MySetImpl.java
@@ -0,0 +1,48 @@
+package code._4_student_effort._9_My_Set;
+
+import java.util.Arrays;
+
+public class MySetImpl<T> implements MySet<T>
+{
+    private Object[] list=new Object[0];
+
+    public void add(T e)
+    {
+        boolean ok=true;
+        for(int i=0;i<list.length;i++)
+            if(list[i].equals(e))
+                ok=false;
+        if(ok==true)
+        {
+            list = Arrays.copyOf(list, list.length + 1);
+            list[list.length - 1] = e;
+        }
+    }
+    public void remove(T e)
+    {
+        for(int i=0;i<list.length;i++)
+        {
+            if(list[i].equals(e))
+                System.arraycopy(list,i+1,list,i,list.length-i-1);
+        }
+    }
+    public T get(int index)
+    {
+        return list[index];
+    }
+    public void set(int index,T e)
+    {
+        list[index]=e;
+    }
+    public int size()
+    {
+        return list.length;
+    }
+    public boolean contains(T e)
+    {
+        for(int i=0;i<list.length;i++)
+            if(list[i].equals(e))
+                return true;
+        return false;
+    }
+}
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diff --git a/_7_concurrency/src/main/java/code/_4_student_effort/_1_rabbbit_race/Challenge.java b/_7_concurrency/src/main/java/code/_4_student_effort/_1_rabbbit_race/Challenge.java
new file mode 100644
index 000000000..071969164
--- /dev/null
+++ b/_7_concurrency/src/main/java/code/_4_student_effort/_1_rabbbit_race/Challenge.java
@@ -0,0 +1,34 @@
+package code._4_student_effort._1_rabbbit_race;
+
+public class Challenge {
+    public static void main(String[] args)
+    {
+        run();
+    }
+
+    public static Thread createRunnable(int i) {
+        return new Thread(new RabbitRunnable(i));
+    }
+
+    public static Thread createThread(int i) {
+        return new Thread(new RabbitThread(i));
+    }
+
+    public static void startThread(Thread x) {
+        x.start();
+    }
+
+    public static Thread selectWhich(int i) {
+        if (i % 2 == 0)
+            return createRunnable(i);
+        else
+            return createThread(i);
+    }
+
+    public static void run() {
+        for (int i = 0; i < 10; i++) {
+            Thread a = selectWhich(i);
+            startThread(a);
+        }
+    }
+}
diff --git a/_7_concurrency/src/main/java/code/_4_student_effort/_1_rabbbit_race/RabbitRunnable.java b/_7_concurrency/src/main/java/code/_4_student_effort/_1_rabbbit_race/RabbitRunnable.java
new file mode 100644
index 000000000..fa198ad23
--- /dev/null
+++ b/_7_concurrency/src/main/java/code/_4_student_effort/_1_rabbbit_race/RabbitRunnable.java
@@ -0,0 +1,15 @@
+package code._4_student_effort._1_rabbbit_race;
+
+public class RabbitRunnable implements Runnable
+{
+    private int nr;
+
+    public RabbitRunnable(int i)
+    {
+        nr=i;
+    }
+    public void run()
+    {
+        System.out.println("Rabbit no "+ nr + "is running");
+    }
+}
diff --git a/_7_concurrency/src/main/java/code/_4_student_effort/_1_rabbbit_race/RabbitThread.java b/_7_concurrency/src/main/java/code/_4_student_effort/_1_rabbbit_race/RabbitThread.java
new file mode 100644
index 000000000..17a62ecc2
--- /dev/null
+++ b/_7_concurrency/src/main/java/code/_4_student_effort/_1_rabbbit_race/RabbitThread.java
@@ -0,0 +1,17 @@
+package code._4_student_effort._1_rabbbit_race;
+
+import java.util.concurrent.RunnableFuture;
+
+public class RabbitThread extends Thread
+{
+    private int nr;
+
+    public RabbitThread(int nr)
+    {
+        this.nr=nr;
+    }
+    public void run()
+    {
+        System.out.println("Rabbit no. "+nr+" is running");
+    }
+}
diff --git a/_7_concurrency/src/main/java/code/_4_student_effort/_2_Bank_transactions/BankAccount.java b/_7_concurrency/src/main/java/code/_4_student_effort/_2_Bank_transactions/BankAccount.java
new file mode 100644
index 000000000..5c8aa60a8
--- /dev/null
+++ b/_7_concurrency/src/main/java/code/_4_student_effort/_2_Bank_transactions/BankAccount.java
@@ -0,0 +1,33 @@
+package code._4_student_effort._2_Bank_transactions;
+
+public class BankAccount
+{
+    private String name;
+    private int debit;
+    public BankAccount(String name,int debit)
+    {
+        this.name=name;
+        this.debit=debit;
+    }
+    public void withdraw(int amount)
+    {
+        simulateLongDatabaseCall();
+        if(debit>=amount)
+            debit=debit-amount;
+        else
+            System.out.println("There are not enough money in this bank");
+    }
+    public void deposit(int amount)
+    {
+        simulateLongDatabaseCall();
+        debit=debit+amount;
+    }
+    public void simulateLongDatabaseCall()
+    {
+        try{
+            Thread.sleep(100);
+        } catch (InterruptedException e){
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/_7_concurrency/src/main/java/code/_4_student_effort/_2_Bank_transactions/Challenge.java b/_7_concurrency/src/main/java/code/_4_student_effort/_2_Bank_transactions/Challenge.java
new file mode 100644
index 000000000..177895388
--- /dev/null
+++ b/_7_concurrency/src/main/java/code/_4_student_effort/_2_Bank_transactions/Challenge.java
@@ -0,0 +1,41 @@
+package code._4_student_effort._2_Bank_transactions;
+
+import code._2_challenge._2_bank_transactions.BankAccount;
+import code._2_challenge._2_bank_transactions.TransactionThread;
+
+public class Challenge
+{
+    public static void main(String[] args) throws Exception
+    {
+       /* BankAccount bank1=new BankAccount("Banca1",100);
+        BankAccount bank2=new BankAccount("Banca2",200);
+        TransactionThread transactionThread1=new TransactionThread("Tranzactie1",bank1,bank2,10);
+        TransactionThread transactionThread2=new TransactionThread("tranzactie2",bank2,bank1,30);
+        transactionThread1.start();
+        transactionThread2.start();
+       // transactionThread1.join();
+       // transactionThread2.join();*/
+        code._2_challenge._2_bank_transactions.BankAccount momAccount = new code._2_challenge._2_bank_transactions.BankAccount("mom", 100_000);
+        code._2_challenge._2_bank_transactions.BankAccount myAccount = new BankAccount("me", 100);
+        System.out.println("before:");
+        System.out.println(momAccount);
+        System.out.println(myAccount);
+
+        code._2_challenge._2_bank_transactions.TransactionThread t1 = new code._2_challenge._2_bank_transactions.TransactionThread("T1", momAccount, myAccount, 10);
+        code._2_challenge._2_bank_transactions.TransactionThread t2 = new TransactionThread("T2", momAccount, myAccount, 100);
+
+        //start transacting
+        t1.start();
+        t2.start();
+
+        //wait for transfers to be completed
+        t1.join();
+        t2.join();
+
+        System.out.println("after:");
+        System.out.println(momAccount);
+        System.out.println(myAccount);
+    }
+
+}
+
diff --git a/_7_concurrency/src/main/java/code/_4_student_effort/_2_Bank_transactions/TransactionThread.java b/_7_concurrency/src/main/java/code/_4_student_effort/_2_Bank_transactions/TransactionThread.java
new file mode 100644
index 000000000..ccb27d4c9
--- /dev/null
+++ b/_7_concurrency/src/main/java/code/_4_student_effort/_2_Bank_transactions/TransactionThread.java
@@ -0,0 +1,35 @@
+package code._4_student_effort._2_Bank_transactions;
+
+public class TransactionThread extends Thread
+{
+    private String name;
+    private BankAccount from;
+    private BankAccount to;
+    private int amount;
+    public TransactionThread(String name,BankAccount from, BankAccount to, int amount)
+    {
+        super(name);
+        this.from=from;
+        this.to=to;
+        this.amount=amount;
+    }
+    public void run()
+    {
+        transfer(from,to,amount);
+    }
+    public boolean transfer(BankAccount from, BankAccount to, int amount)
+    {
+        boolean success = false;
+        synchronized(from) //locking on intrinsic lock of 'from' Object
+        {
+            from.withdraw(amount);
+            synchronized (to) //locking on intrinsic lock of 'to' Object
+            {
+                to.deposit(amount);
+                success=true;
+            }
+        }
+        return success;
+    }
+
+}
diff --git a/_7_concurrency/src/main/java/code/_4_student_effort/_3_rock_paper_scissors/Challenge.java b/_7_concurrency/src/main/java/code/_4_student_effort/_3_rock_paper_scissors/Challenge.java
new file mode 100644
index 000000000..f05d05203
--- /dev/null
+++ b/_7_concurrency/src/main/java/code/_4_student_effort/_3_rock_paper_scissors/Challenge.java
@@ -0,0 +1,17 @@
+package code._4_student_effort._3_rock_paper_scissors;
+
+public class Challenge
+{
+    public static void main(String[] args) throws Throwable
+    {
+        Player p1=new Player("Fabi","");
+        Player p2=new Player("Andra", "");
+        p1.start();
+        p2.start();
+
+        p1.join();
+        p2.join();
+
+        System.out.println("Extragereile au fost "+ p1.getExtragere() + " si "+ p2.getExtragere());
+    }
+}
diff --git a/_7_concurrency/src/main/java/code/_4_student_effort/_3_rock_paper_scissors/Player.java b/_7_concurrency/src/main/java/code/_4_student_effort/_3_rock_paper_scissors/Player.java
new file mode 100644
index 000000000..a4c28d9de
--- /dev/null
+++ b/_7_concurrency/src/main/java/code/_4_student_effort/_3_rock_paper_scissors/Player.java
@@ -0,0 +1,30 @@
+package code._4_student_effort._3_rock_paper_scissors;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Random;
+
+public class Player extends Thread
+{
+    private String nume;
+    private String extragere;
+
+    public Player(String nume,String extragere)
+    {
+        this.nume=nume;
+        this.extragere=extragere;
+    }
+    public void run()
+    {
+        this.randomExtraction();
+    }
+    public void randomExtraction()
+    {
+        List<String> options= Arrays.asList("Piatra","Hartie","Foarfeca");
+        extragere=options.get(new Random().nextInt(3));
+    }
+    public String getExtragere()
+    {
+        return extragere;
+    }
+}
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diff --git a/clean_code_projects/Proiect_java_1/out/production/Proiect_java_1/Package1/Supervisor.class b/clean_code_projects/Proiect_java_1/out/production/Proiect_java_1/Package1/Supervisor.class
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index 000000000..ae291e62e
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diff --git a/clean_code_projects/Proiect_java_1/out/production/Proiect_java_1/Package1/SupervisorFactory.class b/clean_code_projects/Proiect_java_1/out/production/Proiect_java_1/Package1/SupervisorFactory.class
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diff --git a/clean_code_projects/Proiect_java_1/src/Main.java b/clean_code_projects/Proiect_java_1/src/Main.java
new file mode 100644
index 000000000..f42cd4c06
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Main.java
@@ -0,0 +1,16 @@
+import Package1.*;
+
+public class Main
+{
+    public static void main(String[] args)
+    {
+        ObservedSubject supervisor1= HumanFactory.getObservedSubject(new SupervisorFactory());
+        Observer intern1=HumanFactory.getObserver(new InternFactory());
+        Observer  employee1=HumanFactory.getObserver(new EmployeeFactory());
+        supervisor1.register(intern1);
+        supervisor1.register(employee1);
+        supervisor1.notify("Excellent work!");
+        System.out.println("Feedback-ul intern-ului si al angajatului este:");
+        System.out.println(intern1.getFeedback());
+    }
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/Employee.java b/clean_code_projects/Proiect_java_1/src/Package1/Employee.java
new file mode 100644
index 000000000..d4ebda487
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/Employee.java
@@ -0,0 +1,33 @@
+package Package1;
+
+public class Employee implements Observer
+{
+    private String nume;
+    private Integer varsta;
+    private String specializare;
+    private Integer aniExperienta;
+    private String sup;
+    private String feedback;
+
+    public Employee(String n,Integer v,String spec,Integer a,String suup,String fdb)
+    {
+        nume=n;
+        varsta=v;
+        specializare=spec;
+        aniExperienta=a;
+        sup=suup;
+        feedback=fdb;
+    }
+    public Employee()
+    {
+        this("",0,"",0,"","");
+    }
+    public void update(String message)
+    {
+        feedback=message;
+    }
+    public String getFeedback()
+    {
+        return feedback;
+    }
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/EmployeeFactory.java b/clean_code_projects/Proiect_java_1/src/Package1/EmployeeFactory.java
new file mode 100644
index 000000000..c83ffa904
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/EmployeeFactory.java
@@ -0,0 +1,28 @@
+package Package1;
+
+import java.util.Scanner;
+
+public class EmployeeFactory implements HumanAbstractFactory
+{
+    public Observer createObserver()
+    {
+        System.out.println("Introduceti date despre un nou angajat");
+        Scanner input=new Scanner(System.in);
+        System.out.println("Nume;");
+        String n=input.next();
+        System.out.println("Varsta");
+        Integer v=input.nextInt();
+        System.out.println("Specializare:");
+        String s=input.next();
+        System.out.println("Ani_Experienta: ");
+        Integer ani=input.nextInt();
+        System.out.println("Nume Supervisor:");
+        String sup=input.next();
+        return new Employee(n,v,s,ani,sup,"");
+    }
+
+    @Override
+    public ObservedSubject createObservedSubject() {
+        return null;
+    }
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/HumanAbstractFactory.java b/clean_code_projects/Proiect_java_1/src/Package1/HumanAbstractFactory.java
new file mode 100644
index 000000000..bb6214ba9
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/HumanAbstractFactory.java
@@ -0,0 +1,7 @@
+package Package1;
+
+public interface HumanAbstractFactory
+{
+    public ObservedSubject createObservedSubject();
+    public Observer createObserver();
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/HumanFactory.java b/clean_code_projects/Proiect_java_1/src/Package1/HumanFactory.java
new file mode 100644
index 000000000..ab39ab5f9
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/HumanFactory.java
@@ -0,0 +1,13 @@
+package Package1;
+
+public class HumanFactory
+{
+    public static ObservedSubject getObservedSubject(HumanAbstractFactory h)
+    {
+        return h.createObservedSubject();
+    }
+    public static Observer getObserver(HumanAbstractFactory h)
+    {
+        return h.createObserver();
+    }
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/Intern.java b/clean_code_projects/Proiect_java_1/src/Package1/Intern.java
new file mode 100644
index 000000000..34691a2d8
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/Intern.java
@@ -0,0 +1,33 @@
+package Package1;
+
+public class Intern implements Observer
+{
+    private String nume;
+    private String facultate;
+    private Integer varsta;
+    private boolean experientaAnterioara;
+    private String sup;
+    String feedback;
+
+    public Intern(String n,String f,Integer v,boolean e,String s,String fdb)
+    {
+        nume=n;
+        facultate=f;
+        varsta=v;
+        experientaAnterioara=e;
+        sup=s;
+        feedback=fdb;
+    }
+    public Intern()
+    {
+        this("","",0,false,"","");
+    }
+    public void update(String message)
+    {
+        feedback=message;
+    }
+    public String getFeedback()
+    {
+        return feedback;
+    }
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/InternFactory.java b/clean_code_projects/Proiect_java_1/src/Package1/InternFactory.java
new file mode 100644
index 000000000..aa7ae9a7d
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/InternFactory.java
@@ -0,0 +1,28 @@
+package Package1;
+
+import java.util.Scanner;
+
+public class InternFactory implements HumanAbstractFactory
+{
+    public Observer createObserver()
+    {
+        System.out.println("Introduceti date despre un nou intern");
+        Scanner input=new Scanner(System.in);
+        System.out.println("Nume;");
+        String n=input.next();
+        System.out.println("Facultate");
+        String f=input.next();
+        System.out.println("Varsta:");
+        Integer v=input.nextInt();
+        System.out.println("Experienta:(True/False) ");
+        boolean e=input.nextBoolean();
+        System.out.println("Nume Supervisor:");
+        String sup=input.next();
+        return new Intern(n,f,v,e,sup,"");
+    }
+
+    @Override
+    public ObservedSubject createObservedSubject() {
+        return null;
+    }
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/ObservedSubject.java b/clean_code_projects/Proiect_java_1/src/Package1/ObservedSubject.java
new file mode 100644
index 000000000..1d85607ff
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/ObservedSubject.java
@@ -0,0 +1,7 @@
+package Package1;
+
+public interface ObservedSubject {
+    void register(Observer obj);
+    void unregister(Observer obj);
+    void notify(String message);
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/Observer.java b/clean_code_projects/Proiect_java_1/src/Package1/Observer.java
new file mode 100644
index 000000000..c9d68ba28
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/Observer.java
@@ -0,0 +1,7 @@
+package Package1;
+
+public interface Observer {
+    void update(String message);
+
+    public String getFeedback();
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/Supervisor.java b/clean_code_projects/Proiect_java_1/src/Package1/Supervisor.java
new file mode 100644
index 000000000..e59a9b488
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/Supervisor.java
@@ -0,0 +1,50 @@
+package Package1;
+
+import java.util.Arrays;
+
+public class Supervisor implements ObservedSubject
+{
+    private Observer[] observers=new Observer[0];
+
+    private String nume;
+    private String departament;
+    private Integer varsta;
+
+    public Supervisor(String n,String d,Integer v)
+    {
+        nume=n;
+        departament=d;
+        varsta=v;
+    }
+    public Supervisor()
+    {
+        this("","",0);
+    }
+
+    public void register(Observer obs)
+    {
+        this.observers= Arrays.copyOf(observers,observers.length+1);
+        observers[this.observers.length-1]=obs;
+    }
+    public void unregister(Observer obs)
+    {
+        int removedIndex=-1;
+        for(int i=0;i< observers.length;i++)
+        {
+            if(observers[i].equals(obs))
+            {
+                removedIndex = i;
+                break;
+            }
+        }
+        System.arraycopy(observers,removedIndex+1,observers,removedIndex,observers.length-removedIndex-1);
+    }
+
+    public void notify(String message)
+    {
+        for(int i=0;i<observers.length;i++)
+        {
+            observers[i].update(message);
+        }
+    }
+}
diff --git a/clean_code_projects/Proiect_java_1/src/Package1/SupervisorFactory.java b/clean_code_projects/Proiect_java_1/src/Package1/SupervisorFactory.java
new file mode 100644
index 000000000..736a8eaf3
--- /dev/null
+++ b/clean_code_projects/Proiect_java_1/src/Package1/SupervisorFactory.java
@@ -0,0 +1,25 @@
+package Package1;
+
+import java.util.Scanner;
+
+public class SupervisorFactory implements HumanAbstractFactory
+{
+    public ObservedSubject createObservedSubject()
+    {
+        System.out.println("Introduceti date despre nou Supervisor:");
+        Scanner input=new Scanner(System.in);
+        System.out.println("Nume:");
+        String nume=input.next();
+        System.out.println("Departament: ");
+        String dep=input.next();
+        System.out.println("Varsta: ");
+        Integer v=input.nextInt();
+        return new Supervisor(nume,dep,v);
+    }
+
+    @Override
+    public Observer createObserver() {
+        return null;
+    }
+}
+
diff --git a/clean_code_projects/_1_project_requirements_chess/src/main/java/clean/code/chess/requirements/ChessBoard.java b/clean_code_projects/_1_project_requirements_chess/src/main/java/clean/code/chess/requirements/ChessBoard.java
index 1e40d959f..bf9d3809e 100644
--- a/clean_code_projects/_1_project_requirements_chess/src/main/java/clean/code/chess/requirements/ChessBoard.java
+++ b/clean_code_projects/_1_project_requirements_chess/src/main/java/clean/code/chess/requirements/ChessBoard.java
@@ -7,16 +7,61 @@ public class ChessBoard {
 
     private Pawn[][] pieces;
 
-    public ChessBoard() {
+    public ChessBoard()
+    {
         pieces = new Pawn[MAX_BOARD_WIDTH][MAX_BOARD_HEIGHT];
-
     }
 
-    public void Add(Pawn pawn, int xCoordinate, int yCoordinate, PieceColor pieceColor) {
-        throw new UnsupportedOperationException("Need to implement ChessBoard.add()");
+    public void Add(Pawn pawn, int xCoordinate, int yCoordinate, PieceColor pieceColor)
+    {
+        int ok=0;
+        if(IsLegalBoardPosition(xCoordinate,yCoordinate))
+        {
+            if(pieceColor.equals(PieceColor.BLACK))
+            {
+                if(xCoordinate==6)
+                {
+                    if(pieces[xCoordinate][yCoordinate]==null)
+                    {
+                        pawn.setXCoordinate(xCoordinate);
+                        pawn.setYCoordinate(yCoordinate);
+                        pawn.setChessBoard(this);
+                        pieces[xCoordinate][yCoordinate]=pawn;
+                        ok=1;
+                    }
+                }
+            }
+            if(pieceColor.equals(PieceColor.WHITE))
+            {
+                if(xCoordinate==1)
+                {
+                    if(pieces[xCoordinate][yCoordinate]==null)
+                    {
+                        pawn.setXCoordinate(xCoordinate);
+                        pawn.setYCoordinate(yCoordinate);
+                        pawn.setChessBoard(this);
+                        pieces[xCoordinate][yCoordinate]=pawn;
+                        ok=1;
+                    }
+                }
+            }
+        }
+        if(ok==0)
+        {
+            pawn.setXCoordinate(-1);
+            pawn.setYCoordinate(-1);
+        }
     }
 
-    public boolean IsLegalBoardPosition(int xCoordinate, int yCoordinate) {
-        throw new UnsupportedOperationException("Need to implement ChessBoard.IsLegalBoardPosition()");
+    public boolean IsLegalBoardPosition(int xCoordinate, int yCoordinate)
+    {
+        if (xCoordinate <= 7 && xCoordinate >= 0 && yCoordinate >= 0 && yCoordinate <=7)
+            return true;
+        else
+            return false;
+    }
+    public  Pawn getPiece(int x,int y)
+    {
+        return pieces[x][y];
     }
 }
diff --git a/clean_code_projects/_1_project_requirements_chess/src/main/java/clean/code/chess/requirements/Pawn.java b/clean_code_projects/_1_project_requirements_chess/src/main/java/clean/code/chess/requirements/Pawn.java
index e589abeb7..bcb5ddb1b 100644
--- a/clean_code_projects/_1_project_requirements_chess/src/main/java/clean/code/chess/requirements/Pawn.java
+++ b/clean_code_projects/_1_project_requirements_chess/src/main/java/clean/code/chess/requirements/Pawn.java
@@ -43,8 +43,25 @@ private void setPieceColor(PieceColor value) {
         pieceColor = value;
     }
 
-    public void Move(MovementType movementType, int newX, int newY) {
-        throw new UnsupportedOperationException("Need to implement Pawn.Move()");
+    public void Move(MovementType movementType, int newX, int newY)
+    {
+        if(movementType.equals(movementType.MOVE))
+        {
+            if(pieceColor.equals(PieceColor.WHITE))
+            {
+                if(this.getChesssBoard().getPiece(xCoordinate+1,yCoordinate)==null && newX==xCoordinate+1  && newY==yCoordinate)
+                {
+                    xCoordinate=xCoordinate+1;
+                }
+            }
+            if(pieceColor.equals(PieceColor.BLACK)&& newX==xCoordinate-1  && newY==yCoordinate)
+            {
+                if(this.getChesssBoard().getPiece(xCoordinate-1,yCoordinate)==null)
+                {
+                    xCoordinate=xCoordinate-1;
+                }
+            }
+        }
     }
 
     @Override
diff --git a/clean_code_projects/_1_project_requirements_chess/src/test/java/clean/code/chess/requirements/ChessBoardTest.java b/clean_code_projects/_1_project_requirements_chess/src/test/java/clean/code/chess/requirements/ChessBoardTest.java
index 5b8ca4079..681e666cd 100644
--- a/clean_code_projects/_1_project_requirements_chess/src/test/java/clean/code/chess/requirements/ChessBoardTest.java
+++ b/clean_code_projects/_1_project_requirements_chess/src/test/java/clean/code/chess/requirements/ChessBoardTest.java
@@ -39,7 +39,7 @@ public void testIsLegalBoardPosition_True_X_equals_5_Y_equals_5() {
     @Test
     public void testIsLegalBoardPosition_False_X_equals_11_Y_equals_5() {
         boolean isValidPosition = testSubject.IsLegalBoardPosition(11, 5);
-        assertTrue(isValidPosition);
+        assertFalse(isValidPosition);
     }
 
     @Test
diff --git a/clean_code_projects/_1_project_requirements_chess/src/test/java/clean/code/chess/requirements/PawnTest.java b/clean_code_projects/_1_project_requirements_chess/src/test/java/clean/code/chess/requirements/PawnTest.java
index beee03f37..6c24da37a 100644
--- a/clean_code_projects/_1_project_requirements_chess/src/test/java/clean/code/chess/requirements/PawnTest.java
+++ b/clean_code_projects/_1_project_requirements_chess/src/test/java/clean/code/chess/requirements/PawnTest.java
@@ -48,9 +48,9 @@ public void testPawn_Move_IllegalCoordinates_Left_DoesNotMove() {
     @Test
     public void testPawn_Move_LegalCoordinates_Forward_UpdatesCoordinates() {
         chessBoard.Add(testSubject, 6, 3, PieceColor.BLACK);
-        testSubject.Move(MovementType.MOVE, 6, 2);
-        assertEquals(6, testSubject.getXCoordinate());
-        assertEquals(2, testSubject.getYCoordinate());
+        testSubject.Move(MovementType.MOVE, 5, 3);
+        assertEquals(5, testSubject.getXCoordinate());
+        assertEquals(3, testSubject.getYCoordinate());
     }
 
 }
\ No newline at end of file