polymorphism.java

class Animal {
 public void sound() {
 System.out.println("Generic animal sound");
 }
}

class Dog extends Animal {
 @Override
 public void sound() {
 System.out.println("Woof!");
 }
}

class Cat extends Animal {
 @Override
 public void sound() {
 System.out.println("Meow!");
 }
}

public class polymorphism {
 public static void main(String[] args) {
 Animal animal = new Animal();
 animal.sound(); // Generic animal sound

 animal = new Dog();
 animal.sound(); // Woof!

 animal = new Cat();
 animal.sound(); // Meow!
 }
}