Default and Static Method in Interface

Default and Static method in interface is also a one of the inportant fetaure of Java 8. Before Java 8 interfaces only containes abstract method with only method declaration. But from Java 8 interfaces containes default and static method with method body.

Interface With default method :

For creating default method in Java 8 ,we have to use default keyword before the method signature. As shown below

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interface Car{ void BMW(); // Abstract Method default void Audi(){ // Default Method System.out.println("Default Method in Interface"); } }

Interface With static method :

For creating static method in Java 8 ,we have to use static keyword before the method signature. As shown below

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interface Car{ void BMW(); // Abstract Method static void Audi(){ // Static Method System.out.println("Static Method in Interface"); } }

Example:

Complete example of default and static method is shown below :

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interface Audi{ void show(); default void defaultMethod(){ System.out.println("DEFAULT INTERFACE METHOD OF AUDI "); } static void AUDIstaticMethod(){ System.out.println("STATIC METHOD OF AUDI"); } } interface BMW{ default void defaultMethod(){ System.out.println("DEFAULT INTERFACE METHOD OF BMW "); } static void BMWstaticMethod(){ System.out.println("STATIC METHOD OF BMW"); } } class Vehicle implements Audi,BMW{ @Override public void show() { // TODO Auto-generated method stub } @Override public void defaultMethod() { // TODO Auto-generated method stub Audi.super.defaultMethod(); Audi.AUDIstaticMethod(); BMW.super.defaultMethod(); BMW.BMWstaticMethod(); } } public class DefaultAndStaticMethodInInterfaces { public static void main(String[] args) { Audi c = new Vehicle(); c.defaultMethod(); } }

Output:

DEFAULT INTERFACE METHOD OF AUDI 

STATIC METHOD OF AUDI

DEFAULT INTERFACE METHOD OF BMW 

STATIC METHOD OF BMW

      

Blog Author - Pushkar Khosla,
Software Developer by Profession with 3.0 Yrs of Experience , through this blog i'am sharing my industrial Java Knowledge to entire world. For any question or query any one can comment below or mail me at pushkar.itsitm52@gmail.com.

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