Java Interface Tutorial

An interface is like a blue print of Java Class, Interface has static constants and abstract method. Interface is implemented in multiple inheritance.

Interface is similar to Class.It dose not contain construction.Implement keyword is used to implement interface in class and extend keyword is used to extend an interface.

Java Interfaces Declaration

import java.lang.*;


public interface Interface_Name {
   
   //Abstract method declarations\
}

Java Interface Example

interface Pet{ 
  public void test(); 
} 
class Dog implements Pet{ 
   public void test(){ 
     System.out.println("Interface Method Implemented"); 
  } 
   public static void main(String args[]){ 
     Pet p = new Dog(); 
     p.test(); 
  } 
}

Class vs Interface