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Message: <blockquote data-quote="sihina_lahiru" data-source="post: 7285029" data-attributes="member: 149577">Java Interface example                                                                                                                                                       <ol> <li data-xf-list-type="ol">/*</li> <li data-xf-list-type="ol">Java Interface example.</li> <li data-xf-list-type="ol">This Java Interface example describes how interface is defined and </li> <li data-xf-list-type="ol">being used in Java language.</li> <li data-xf-list-type="ol"> </li> <li data-xf-list-type="ol">Syntax of defining java interface is,</li> <li data-xf-list-type="ol"><modifier> interface <interface-name>{</li> <li data-xf-list-type="ol">  //members and methods()</li> <li data-xf-list-type="ol">}</li> <li data-xf-list-type="ol">*/</li> <li data-xf-list-type="ol"> </li> <li data-xf-list-type="ol">//declare an interface</li> <li data-xf-list-type="ol">interface IntExample{</li> <li data-xf-list-type="ol"> </li> <li data-xf-list-type="ol">  /*</li> <li data-xf-list-type="ol">  Syntax to declare method in java interface is,</li> <li data-xf-list-type="ol">  <modifier> <return-type> methodName(<optional-parameters>);</li> <li data-xf-list-type="ol">  IMPORTANT : Methods declared in the interface are implicitly public and abstract.</li> <li data-xf-list-type="ol">  */</li> <li data-xf-list-type="ol"> </li> <li data-xf-list-type="ol">  public void sayHello();</li> <li data-xf-list-type="ol">  }</li> <li data-xf-list-type="ol">}</li> <li data-xf-list-type="ol">/*</li> <li data-xf-list-type="ol">Classes are extended while interfaces are implemented.</li> <li data-xf-list-type="ol">To implement an interface use implements keyword.</li> <li data-xf-list-type="ol">IMPORTANT : A class can extend only one other class, while it </li> <li data-xf-list-type="ol">can implement n number of interfaces.</li> <li data-xf-list-type="ol">*/</li> <li data-xf-list-type="ol"> </li> <li data-xf-list-type="ol">public class JavaInterfaceExample implements IntExample{</li> <li data-xf-list-type="ol">  /*</li> <li data-xf-list-type="ol">  We have to define the method declared in implemented interface,</li> <li data-xf-list-type="ol">  or else we have to declare the implementing class as abstract class.</li> <li data-xf-list-type="ol">  */</li> <li data-xf-list-type="ol"> </li> <li data-xf-list-type="ol">  public void sayHello(){</li> <li data-xf-list-type="ol">    System.out.println("Hello Visitor !");</li> <li data-xf-list-type="ol">  }</li> <li data-xf-list-type="ol"> </li> <li data-xf-list-type="ol">  public static void main(String args[]){</li> <li data-xf-list-type="ol">    //create object of the class</li> <li data-xf-list-type="ol">    JavaInterfaceExample javaInterfaceExample = new JavaInterfaceExample();</li> <li data-xf-list-type="ol">    //invoke sayHello(), declared in IntExample interface.</li> <li data-xf-list-type="ol">    javaInterfaceExample.sayHello();</li> <li data-xf-list-type="ol">  }</li> <li data-xf-list-type="ol">}</li> <li data-xf-list-type="ol"> </li> <li data-xf-list-type="ol">/*</li> <li data-xf-list-type="ol">OUTPUT of the above given Java Interface example would be :</li> <li data-xf-list-type="ol">Hello Visitor !</li> <li data-xf-list-type="ol">*/</li> </ol></blockquote>

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