Java - Interface

What is interface?
An interface in java is a blueprint of a class. It has static constants and abstract methods. The interface in Java is a mechanism to achieve abstraction. There can be only abstract methods in the Java interface, not method body.
DescriptionAn interface in the Java programming language is an abstract type that is used to specify a behavior that classes must implement. They are similar to protocols. Interfaces are declared using the interface keyword, and may only contain method signature and constant declarations

Eg:

nterface Ani{

 public void disp(); 

 public void sleep();

}

class test implements Ani {

  public void disp() {

    System.out.println("The pig says: wee wee");

  }

  public void sleep() {

    System.out.println("Zzz");

  }

}

class Dsp {

  public static void main(String[] args) {

    test t1 = new test();  

    t1.disp();

    t1.sleep();

  }

}