Pet project

.gitignore

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+.idea/
+out/
+*.iml
+stale_outputs_checked

src/pointer/pet/Cat.java

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+package pointer.pet;
+
+public class Cat extends Pet {
+    @Override
+    void voice() {
+        System.out.println("I am a cat - meow.");
+    }
+}

src/pointer/pet/Cow.java

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+package pointer.pet;
+
+public class Cow extends Pet {
+    @Override
+    void voice() {
+        System.out.println("I am a cow - moo.");
+    }
+}

src/pointer/pet/Dog.java

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+package pointer.pet;
+
+public class Dog extends Pet {
+    @Override
+    void voice() {
+        System.out.println("I am a dog - woof.");
+    }
+}

src/pointer/pet/Main.java

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+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();
+    }
+}

src/pointer/pet/Pet.java

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+package pointer.pet;
+
+public abstract class Pet {
+    abstract void voice();
+}