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Interface in Java

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An <b>interface in java</b> is a blueprint of a class. It has static constants and abstract methods only.</div>
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The interface in java is <b>a mechanism to achieve fully abstraction</b>. There can be only abstract methods in the java interface not method body. It is used to achieve fully abstraction and multiple inheritance in Java.</div>
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Java Interface also <b>represents IS-A relationship</b>.</div>
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It cannot be instantiated just like abstract class.</div>
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Why use Java interface?</h2>
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There are mainly three reasons to use interface. They are given below.</div>
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<li style="font-family: Verdana; font-stretch: normal; line-height: 1.5; margin-top: 3px;">It is used to achieve fully abstraction.</li>
<li style="font-family: Verdana; font-stretch: normal; line-height: 1.5; margin-top: 3px;">By interface, we can support the functionality of multiple inheritance.</li>
<li style="font-family: Verdana; font-stretch: normal; line-height: 1.5; margin-top: 3px;">It can be used to achieve loose coupling.</li>
</ul>
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The java compiler adds public and abstract keywords before the interface method and public, static and final keywords before data members.</h4>
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In other words, Interface fields are public, static and final bydefault, and methods are public and abstract.</div>
<img alt="interface" src="http://www.javatpoint.com/images/interface.JPG" style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; height: auto; line-height: 23px; max-width: 100%;" /><span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><br />
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Understanding relationship between classes and interfaces</h4>
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As shown in the figure given below, a class extends another class, an interface extends another interface but a <b>class implements an interface</b>.</div>
<img alt="relationship between class and interface" src="http://www.javatpoint.com/images/core/interfacerelation.jpg" style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; height: auto; line-height: 23px; max-width: 100%;" /><span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><br />
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<h2 class="h3ex" style="background-color: white; color: #610b4b; font-family: tahoma; font-size: 22px; font-stretch: normal; font-weight: 400;">
Simple example of Java interface</h2>
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<tr><td style="font-stretch: normal; margin-left: 20px;">In this example, Printable interface have only one method, its implementation is provided in the A class.</td></tr>
</tbody></table>
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<ol class="dp-j" start="1" style="border: none; margin: 0px; padding: 0px;">
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">interface</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> printable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print();  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> A6 </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">implements</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> printable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print(){System.out.println(</span><span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"Hello"</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">);}  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">static</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> main(String args[]){  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">A6 obj = <span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">new</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> A6();  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">obj.print();  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> }  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
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<span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><span class="testit" style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"><span style="color: white; font-family: Verdana;"><span style="background-color: #6699cc; border-radius: 9px; font-weight: 700; line-height: 1.5; padding: 4px 30px;">Test it Now</span></span></span><span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><br />
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<pre>Output:Hello
</pre>
</div>
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Multiple inheritance in Java by interface</h2>
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If a class implements multiple interfaces, or an interface extends multiple interfaces i.e. known as multiple inheritance.</div>
<span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><img alt=" multiple inheritance in java" src="http://www.javatpoint.com/images/core/multipleinheritance.jpg" style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; height: auto; line-height: 23px; max-width: 100%;" /><span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><br />
<div class="codeblock" style="-webkit-box-shadow: rgb(212, 212, 212) 8px 3px 10px; background-color: white; border: 1px solid rgb(213, 221, 198); box-shadow: rgb(212, 212, 212) 5px 3px 10px; font-family: verdana; font-size: 13px; line-height: 23px; margin: 5px 0px 10px; padding: 0px; width: 854px;">
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<ol class="dp-j" start="1" style="border: none; margin: 0px; padding: 0px;">
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">interface</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Printable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print();  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">interface</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Showable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> show();  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> A7 </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">implements</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Printable,Showable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print(){System.out.println(</span><span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"Hello"</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">);}  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> show(){System.out.println(</span><span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"Welcome"</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">);}  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">static</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> main(String args[]){  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">A7 obj = <span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">new</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> A7();  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">obj.print();  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">obj.show();  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> }  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
</ol>
</div>
</div>
<span class="testit" style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"><span style="color: white; font-family: Verdana;"><span style="background-color: #6699cc; border-radius: 9px; font-weight: 700; line-height: 1.5; padding: 4px 30px;">Test it Now</span></span></span><span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><br />
<div class="codeblock3" style="background: rgb(249, 251, 249); border: 1px solid rgb(213, 221, 198); font-family: verdana; font-size: 13px; line-height: 23px; margin: 5px 0px 10px; padding: 0px 0px 0px 10px; width: 845.453125px;">
<pre>Output:Hello
       Welcome
</pre>
</div>
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Q) Multiple inheritance is not supported through class in java but it is possible by interface, why?</h2>
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<tr><td style="font-stretch: normal; margin-left: 20px;">As we have explained in the inheritance chapter, multiple inheritance is not supported in case of class. But it is supported in case of interface because there is no ambiguity as implementation is provided by the implementation class. For example:</td></tr>
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<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">interface</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Printable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print();  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">interface</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Showable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print();  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> testinterface1 </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">implements</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Printable,Showable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print(){System.out.println(</span><span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"Hello"</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">);}  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">static</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> main(String args[]){  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">testinterface1 obj = <span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">new</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> testinterface1();  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">obj.print();  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> }  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
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<span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><span class="testit" style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"><span style="color: white; font-family: Verdana;"><span style="background-color: #6699cc; border-radius: 9px; font-weight: 700; line-height: 1.5; padding: 4px 30px;">Test it Now</span></span></span><span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><br />
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<pre>Hello
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As you can see in the above example, Printable and Showable interface have same methods but its implementation is provided by class A, so there is no ambiguity.</div>
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Interface inheritance</h2>
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A class implements interface but one interface extends another interface .</div>
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<ol class="dp-j" start="1" style="border: none; margin: 0px; padding: 0px;">
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">interface</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Printable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print();  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">interface</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Showable </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">extends</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Printable{  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> show();  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Testinterface2 </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">implements</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Showable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print(){System.out.println(</span><span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"Hello"</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">);}  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> show(){System.out.println(</span><span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"Welcome"</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">);}  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">static</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> main(String args[]){  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">Testinterface2 obj = <span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">new</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Testinterface2();  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">obj.print();  </span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">obj.show();  </span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> }  </span></li>
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<span class="testit" style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"><span style="color: white; font-family: Verdana;"><span style="background-color: #6699cc; border-radius: 9px; font-weight: 700; line-height: 1.5; padding: 4px 30px;">Test it Now</span></span></span><span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"></span><br />
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<pre>       Hello
       Welcome
</pre>
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<h2 class="h2" style="background-color: white; color: #610b38; font-family: erdana, helvetica, arial, sans-serif; font-size: 25px; font-weight: 400; line-height: 23px;">
Q) What is marker or tagged interface?</h2>
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An interface that have no member is known as marker or tagged interface. For example: Serializable, Cloneable, Remote etc. They are used to provide some essential information to the JVM so that JVM may perform some useful operation.</div>
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<ol class="dp-j" start="1" style="border: none; margin: 0px; padding: 0px;">
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//How Serializable interface is written?</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">public</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">interface</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Serializable{  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">}  </span></li>
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Nested Interface in Java</h4>
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Note: An interface can have another interface i.e. known as nested interface. We will learn it in detail in the nested classes chapter. For example:</div>
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<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">interface</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> printable{  </span></span></li>
<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> <span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> print();  </span></span></li>
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<li class="" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">   <span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">void</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> msg();  </span></span></li>
<li class="alt" style="border: none; font-family: Verdana; font-stretch: normal; line-height: 1.5; margin: 3px 0px 0px; padding: 0px 3px 0px 10px !important; width: 845.453125px;"><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> }  </span></li>
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Interface in Java

Interface in Java

An interface in java is a blueprint of a class. It has static constants and abstract methods only. The interface in java is a mec...

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