What advantages does polymorphism in Java offer?

Polymorphism in Java allows objects of different classes to respond to the same method call in different ways. This provides the following advantages:

• Simplification of code: you can write general code without worrying about specific object types.
• Extensibility: easily add new classes with their own method implementations without changing existing code.
• Increased flexibility and reusability of code.

Example:

interface Animal {
    void sound();
}

class Dog implements Animal {
    public void sound() { System.out.println("Bark"); }
}

class Cat implements Animal {
    public void sound() { System.out.println("Meow"); }
}

public class Main {
    public static void main(String[] args) {
        Animal a = new Dog();
        a.sound(); // Bark
        a = new Cat();
        a.sound(); // Meow
    }
}