added basic codes

Basic/BooleansComparision.java

@@ -0,0 +1,12 @@
+public class BooleansComparision{
+    public static void main(String[] arg){
+       String chemistryGrade = "25";
+       String biologyGrade = "75";
+       String englishGrade = "25";
+       System.out.println(!chemistryGrade.equals(englishGrade));
+       System.out.println(!biologyGrade.equals(englishGrade));
+       System.out.println(chemistryGrade.equals(englishGrade));
+
+
+    }
+}

Basic/Dealership.java

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+import java.util.Scanner;
+
+public class Dealership {
+    public static void main(String []arg){
+        Scanner scan = new Scanner (System.in);
+        //a simple application that uses switch statements and if-else statments for car dealership
+        //show options available
+        System.out.println("Welcome to the Java Dealership");
+        System.out.println("-Select option 'a' to buy a car");
+        System.out.println("-Select option 'b' to sell a car"); 
+        //take user input
+        String option = scan.nextLine();
+
+        switch (option){
+         //to buy a car
+            case "a" :System.out.println("What is your budget?");
+                     int budget = scan.nextInt(); 
+                     if(budget >= 30000){
+                        System.out.println("Great! A Dodge charger is available");
+                        System.out.println("\nDo you have an insurance? Write 'Yes' or 'No'");
+                        scan.nextLine();
+                           String insurance = scan.nextLine();
+                        System.out.println("\nDo you have a driver's licence? 'Yes' or 'no'");
+                        String licence = scan.nextLine();
+                        System.out.println("\nWhat is your credit score?");
+                           int creditScore = scan.nextInt();
+                        if(insurance.equals("yes") && licence.equals("yes") && creditScore > 660){
+                            System.out.println("\nSold! Pleasure doing business with you");
+                        } else {
+                         System.out.println("We're sorry. You are not eligible.");
+                          } 
+
+                    }break;
+
+            //to sell a car
+            case "b" :System.out.println("\nWhat is your car valued at?");
+                           int value = scan.nextInt();
+                        System.out.println("\nWhat is you selling price?");
+                           int price = scan.nextInt(); 
+
+                     if (value > price && price < 30000){
+                        System.out.println("\nWe will buy your car. Pleasure doing business with you!");
+                     } else {
+                         System.out.println("\nSorry, we are not interested.");;
+                     }break;
+
+            default  :System.out.println("Invalid option");  
+        }
+      scan.close();
+        }
+}

Basic/IfElse.java

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+public class IfElse {
+    public static void main(String []arg){
+        int grade = 88;
+        double gpa = 5.0;
+    if(grade>=80 && gpa >=4.0){
+        System.out.println("You got an A");
+    }else if(grade >= 70 && gpa >= 3.0){
+        System.out.println("You got a B");
+    }else if(grade >= 60 && gpa >= 2.0){
+        System.out.println("You got a c");
+    }else if(grade <60 && gpa <2){
+        System.out.println("You got a D");
+    }else{
+        System.out.println("Study hard next time.");
+    }
+
+    }
+
+
+}

Basic/LogicalOperators.java

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+public class LogicalOperators {
+    public static void main(String []arg){
+        int chemistry = 58;
+        int eng = 67;
+        String lang = "Java";
+        if(chemistry > 75 || eng > 75 || lang.equals("Java")){
+            System.out.println("you got admission");
+
+        }else{
+            System.out.println("we are sorry");
+        }
+
+    }
+
+}

Basic/SwitchStatement.java

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+public class SwitchStatement {
+    public static void main(String []arg){
+        int month = 5;
+        switch (month){
+            //checks the value declared with the case value
+            case 1  : System.out.println("January"); break;
+            case 2  : System.out.println("February"); break;
+            case 3  : System.out.println("March"); break;
+            case 4  : System.out.println("April"); break;
+            case 5  : System.out.println("May"); break;
+            case 6  : System.out.println("june"); break;
+            case 7  : System.out.println("July"); break;
+            case 8  : System.out.println("August"); break;
+            case 9  : System.out.println("September"); break;
+            case 10 : System.out.println("October"); break;
+            case 11 : System.out.println("November"); break;
+            case 12 : System.out.println("December"); break;
+            default : System.out.println("Please enter a valid month");
+        }
+    }
+
+}