INTERFACE

EXPLAIN ;

> An interface in Java is a blueprint of a class. A Java interface contains static constants and abstract methods.

> The interface in Java is a mechanism to achieve abstraction.

> A class implements an Interface to inherit the abstract methods.

ADVANTAGES ;

> Java Interface supports Multiple Inheritance.

> Java Interface enables programmers to break up the complex programming approaches.

> simplify the dependencies between the objects.
Java Interface makes the data members.

> methods in an application to be loosely coupled.

DISADVANTAGES ;

> Use of Java Interface brings down the execution speed of the application.

> Java Interfaces in the application are either used repeatedly at large extent or hardly used at all.

ABSTRACT ;

> Abstract class can have abstract and non-abstract methods.

> Abstract class doesn’t support multiple inheritance.

> Abstract class can have final, non-final, static and non-static variables.

> An abstract class can be extended using keyword extends.

PROGRAM ;

interface In1 {



// public, static and final

final int a = 100;



// public and abstract

void display();

}



class TestClass implements In1 {





public void display() {

System.out.println(“values”);

}



public static void main(String[] args)

{

TestClass t = new TestClass();

t.display();

System.out.println(a);