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Java Default Methods


Default methods In Java:


An interface can have static and default methods.
Default methods enable us to add new functionality to existing interfaces.
This feature was introduced in java 8 to ensure backward compatibility while updating an interface.
A class implementing the interface need not implement the default methods.
Interfaces can also include private methods for default methods to use.
You can easily override a default method like any other method of an interface.

Example


interface Animal{
    // Default method
    default void say(){
        System.out.println("Hello, this is default method");
    }
    // Abstract method
    void bark();
}
public class CWH implements Animal{

    @Override
    public void bark() {
        System.out.println("Dog barks!");
    }
    public static void main(String[] args) {
        CWH obj1 = new CWH();
        obj1.bark();
        obj1.say();

    }


}

Output

Dog barks!
Hello, this is default method

Example


interface Animal{
    // Default method
    default void say(){
        System.out.println("Hello, this is default method");
    }
    // Abstract method
    void bark();
}
public class CWH implements Animal{

    @Override
    public void bark() {
        System.out.println("Dog barks!");
    }
    public static void main(String[] args) {
        CWH obj1 = new CWH();
        obj1.bark();
        obj1.say();

    }


}


Conclusion

In this page (written and validated by ) you learned about Java Default Methods . What's Next? If you are interested in completing Java tutorial, your next topic will be learning about: Java Inheritance in Interfaces.



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