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What are defender methods or virtual methods in Java?
The default methods in an interface in Java are also known as defender methods or, virtual methods.
The defender/virtual methods are those that will have a default implementation in an interface. You can define defender/virtual methods using the default keyword as −
default void display() { System.out.println("This is a default method"); }
There is no need to implement these defender/virtual methods in the implementing classes you can call them directly.
If you have an interface which is implemented by some classes and if you want to add a new method int it.
Then, you need to implement this newly added method in all the exiString classes that implement this interface. Which is a lot of work.
To resolve this, you can write a default/defender/virtual method for all the newly implemented methods.
Example
Following Java Example demonstrates the usage of the default method in Java.
interface sampleInterface{ public void demo(); default void display() { System.out.println("This is a default method"); } } public class DefaultMethodExample implements sampleInterface{ public void demo() { System.out.println("This is the implementation of the demo method"); } public static void main(String args[]) { DefaultMethodExample obj = new DefaultMethodExample(); obj.demo(); obj.display(); } }
Output
This is the implementation of the demo method This is a default method
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