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Cat.java

@@ -0,0 +1,11 @@
+package pointer.pet;
+
+public class Cat extends Pet {
+    public Cat() {
+    }
+
+    @Override
+    void voice() {
+        System.out.println("Я кіт- Мяууу-Мяууу");
+    }
+}

Cow.java

@@ -0,0 +1,12 @@
+package pointer.pet;
+
+public class Cow extends Pet {
+
+    public Cow() {
+    }
+
+    @Override
+    void voice() {
+        System.out.println("Я корова- Мууу-Мууу");
+    }
+}

Dog.java

@@ -0,0 +1,11 @@
+package pointer.pet;
+
+public class Dog extends Pet {
+    public Dog() {
+    }
+
+    @Override
+    void voice() {
+        System.out.println("Я пес- Гаууу-Гаууу");
+    }
+}

Main.java

@@ -0,0 +1,19 @@
+package pointer.pet;
+
+public class Main {
+
+    public static void main(String[] args) {
+        MakeVoice(new Dog());
+        MakeVoice(new Cat());
+        MakeVoice(new Cow());
+
+    }
+
+    static void MakeVoice(Pet pet) {
+        pet.voice();
+    }
+
+}
+
+
+

Pet.java

@@ -0,0 +1,7 @@
+package pointer.pet;
+
+public abstract class Pet {
+    abstract void voice();
+
+
+}