Java Interface example


Java Interface example.

This Java Interface example describes how interface is defined and

being used in Java language.

Syntax of defining java interface is,

<modifier> interface <interface-name>{

//members and methods()



//declare an interface

interface IntExample{


Syntax to declare method in java interface is,

<modifier> <return-type> methodName(<optional-parameters>);

IMPORTANT : Methods declared in the interface are implicitly public and abstract.


public void sayHello();




Classes are extended while interfaces are implemented.

To implement an interface use implements keyword.

IMPORTANT : A class can extend only one other class, while it

can implement n number of interfaces.


public class JavaInterfaceExample implements IntExample{


We have to define the method declared in implemented interface,

or else we have to declare the implementing class as abstract class.


public void sayHello(){

System.out.println(“Hello Visitor !”);


public static void main(String args[]){

//create object of the class

JavaInterfaceExample javaInterfaceExample = new JavaInterfaceExample();

//invoke sayHello(), declared in IntExample interface.





OUTPUT of the above given Java Interface example would be :

Hello Visitor !



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