diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c6d544b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.idea/
+out/
+*.iml
+stale_outputs_checked
diff --git a/src/pointer/pet/Cat.java b/src/pointer/pet/Cat.java
new file mode 100644
index 0000000..64b7340
--- /dev/null
+++ b/src/pointer/pet/Cat.java
@@ -0,0 +1,8 @@
+package pointer.pet;
+
+public class Cat extends Pet {
+    @Override
+    void voice() {
+        System.out.println("I am a cat - meow.");
+    }
+}
diff --git a/src/pointer/pet/Cow.java b/src/pointer/pet/Cow.java
new file mode 100644
index 0000000..a19572d
--- /dev/null
+++ b/src/pointer/pet/Cow.java
@@ -0,0 +1,8 @@
+package pointer.pet;
+
+public class Cow extends Pet {
+    @Override
+    void voice() {
+        System.out.println("I am a cow - moo.");
+    }
+}
diff --git a/src/pointer/pet/Dog.java b/src/pointer/pet/Dog.java
new file mode 100644
index 0000000..c10c40e
--- /dev/null
+++ b/src/pointer/pet/Dog.java
@@ -0,0 +1,8 @@
+package pointer.pet;
+
+public class Dog extends Pet {
+    @Override
+    void voice() {
+        System.out.println("I am a dog - woof.");
+    }
+}
diff --git a/src/pointer/pet/Main.java b/src/pointer/pet/Main.java
new file mode 100644
index 0000000..f4d2e1e
--- /dev/null
+++ b/src/pointer/pet/Main.java
@@ -0,0 +1,14 @@
+package pointer.pet;
+
+public class Main {
+
+    public static void main(String[] args) {
+        doSound(new Cat());
+        doSound(new Dog());
+        doSound(new Cow());
+    }
+
+    static void doSound(Pet pet) {
+        pet.voice();
+    }
+}
diff --git a/src/pointer/pet/Pet.java b/src/pointer/pet/Pet.java
new file mode 100644
index 0000000..fb3dc14
--- /dev/null
+++ b/src/pointer/pet/Pet.java
@@ -0,0 +1,5 @@
+package pointer.pet;
+
+public abstract class Pet {
+    abstract void voice();
+}