Monday, 6 March 2017

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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