How do I implement polymorphism in Java?

How do I implement polymorphism in Java?

Polymorphism in Java allows methods to do different things based on the object that it is acting upon. You can implement it using method overriding and method overloading.

Can you give me an example of method overriding?

Sure! Here's a simple example:

class Animal {
    void sound() {
        System.out.println("Animal makes a sound");
    }
}

class Dog extends Animal {
    void sound() {
        System.out.println("Dog barks");
    }
}

public class TestPolymorphism {
    public static void main(String[] args) {
        Animal myDog = new Dog();
        myDog.sound(); // Outputs: Dog barks
    }
}

What about method overloading?

Method overloading allows you to create multiple methods with the same name but different parameters. For example:

class MathUtils {
    int add(int a, int b) {
        return a + b;
    }
    double add(double a, double b) {
        return a + b;
    }
}

How do I decide when to use polymorphism?

Use polymorphism when you want to allow for flexibility and the ability to extend your code. It helps in reducing code duplication and improving maintainability.