Java Interface Example

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/*
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.
javaInterfaceExample.sayHello();
}
}
/*
OUTPUT of the above given Java Interface example would be :
Hello Visitor !
*/

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