Pcgamesoftware: Java OOPs Concepts

Java instance of operater

<div dir="ltr" style="text-align: left;" trbidi="on">
<script async="" src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>

<br />
<ins class="adsbygoogle" data-ad-client="ca-pub-1565131295247600" data-ad-slot="9964251370" style="display: inline-block; height: 100px; width: 700px;"><span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">The </span><b style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">java instanceof operator</b><span style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;"> is used to test whether the object is an instance of the specified type (class or subclass or interface).</span></ins><div dir="ltr" style="text-align: left;" trbidi="on">
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
The instanceof in java is also known as type <i>comparison operator</i>because it compares the instance with type. It returns either true or false. If we apply the instanceof operator with any variable that has null value, it returns false.</div>
<h3 class="h3ex" style="background-color: white; color: #610b4b; font-family: tahoma; font-size: 22px; font-stretch: normal; font-weight: 400;">
Simple example of java instanceof</h3>
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
Let's see the simple example of instance operator where it tests the current class.</div>
<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;">
<div class="dp-highlighter" style="margin: 8px 0px !important; overflow: hidden; padding-top: 0px; width: 845.453125px;">
<div class="bar" style="padding-left: 45px;">
<div class="tools">
</div>
</div>
<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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Simple1{  </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;">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;"> Simple1 s=<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;"> Simple1();  </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;"> System.out.println(s <span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">instanceof</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Simple);</span><span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//true</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></li>
</ol>
</div>
</div>
<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 />
<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:true
</pre>
</div>
<hr style="background-color: #d4d4d4; border: 0px; clear: both; color: #d4d4d4; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; height: 1px; line-height: 23px;" />
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
An object of subclass type is also a type of parent class. For example, if Dog extends Animal then object of Dog can be referred by either Dog or Animal class.</div>
<h2 class="h3ex" style="background-color: white; color: #610b4b; font-family: tahoma; font-size: 22px; font-stretch: normal; font-weight: 400;">
Another example of java instanceof operator</h2>
<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;">
<div class="dp-highlighter" style="margin: 8px 0px !important; overflow: hidden; padding-top: 0px; width: 845.453125px;">
<div class="bar" style="padding-left: 45px;">
<div class="tools">
</div>
</div>
<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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Animal{}  </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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Dog1 </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;"> Animal{</span><span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//Dog inherits Animal</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;"> Dog1 d=<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;"> Dog1();  </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;"> System.out.println(d <span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">instanceof</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Animal);</span><span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//true</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></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:true
</pre>
</div>
<hr style="background-color: #d4d4d4; border: 0px; clear: both; color: #d4d4d4; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; height: 1px; line-height: 23px;" />
<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;">
instanceof in java with a variable that have null value</h2>
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
If we apply instanceof operator with a variable that have null value, it returns false. Let's see the example given below where we apply instanceof operator with the variable that have null value.</div>
<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;">
<div class="dp-highlighter" style="margin: 8px 0px !important; overflow: hidden; padding-top: 0px; width: 845.453125px;">
<div class="bar" style="padding-left: 45px;">
<div class="tools">
</div>
</div>
<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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Dog2{  </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;">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;">  Dog2 d=<span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">null</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;">  System.out.println(d <span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">instanceof</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Dog2);</span><span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//false</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></li>
</ol>
</div>
</div>
<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 />
<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:false
</pre>
</div>
<hr style="background-color: #d4d4d4; border: 0px; clear: both; color: #d4d4d4; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; height: 1px; line-height: 23px;" />
<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;">
Downcasting with java instanceof operator</h2>
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
When Subclass type refers to the object of Parent class, it is known as downcasting. If we perform it directly, compiler gives Compilation error. If you perform it by typecasting, ClassCastException is thrown at runtime. But if we use instanceof operator, downcasting is possible.</div>
<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;">
<div class="dp-highlighter" style="margin: 8px 0px !important; overflow: hidden; padding-top: 0px; width: 845.453125px;">
<div class="bar" style="padding-left: 45px;">
<div class="tools">
</div>
</div>
<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 style="background-color: inherit; border: none; margin: 0px; padding: 0px;">Dog d=</span><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;"> Animal();</span><span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//Compilation error</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></span></li>
</ol>
</div>
</div>
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
If we perform downcasting by typecasting, ClassCastException is thrown at runtime.</div>
<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;">
<div class="dp-highlighter" style="margin: 8px 0px !important; overflow: hidden; padding-top: 0px; width: 845.453125px;">
<div class="bar" style="padding-left: 45px;">
<div class="tools">
</div>
</div>
<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 style="background-color: inherit; border: none; margin: 0px; padding: 0px;">Dog d=(Dog)</span><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;"> Animal();  </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="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//Compiles successfully but ClassCastException is thrown at runtime</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></span></li>
</ol>
</div>
</div>
<h3 class="h3" style="background-color: white; color: #610b4b; font-family: erdana, helvetica, arial, sans-serif; font-size: 21px; font-weight: 400; line-height: 23px;">
Possibility of downcasting with instanceof</h3>
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
Let's see the example, where downcasting is possible by instanceof operator.</div>
<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;">
<div class="dp-highlighter" style="margin: 8px 0px !important; overflow: hidden; padding-top: 0px; width: 845.453125px;">
<div class="bar" style="padding-left: 45px;">
<div class="tools">
</div>
</div>
<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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Animal { }  </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;"> Dog3 </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;"> Animal {  </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;">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;"> method(Animal a) {  </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;">if</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">(a </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">instanceof</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Dog3){  </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;">       Dog3 d=(Dog3)a;<span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//downcasting</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;">       System.out.println(<span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"ok downcasting performed"</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></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;">    Animal a=<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;"> Dog3();  </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;">    Dog3.method(a);  </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>
<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>
</ol>
</div>
</div>
<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 />
<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:ok downcasting performed
</pre>
</div>
<hr style="background-color: #d4d4d4; border: 0px; clear: both; color: #d4d4d4; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; height: 1px; line-height: 23px;" />
<h3 class="h3" style="background-color: white; color: #610b4b; font-family: erdana, helvetica, arial, sans-serif; font-size: 21px; font-weight: 400; line-height: 23px;">
Downcasting without the use of java instanceof</h3>
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
Downcasting can also be performed without the use of instanceof operator as displayed in the following example:</div>
<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;">
<div class="dp-highlighter" style="margin: 8px 0px !important; overflow: hidden; padding-top: 0px; width: 845.453125px;">
<div class="bar" style="padding-left: 45px;">
<div class="tools">
</div>
</div>
<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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Animal { }  </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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Dog4 </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;"> Animal {  </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;">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;"> method(Animal a) {  </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;">       Dog4 d=(Dog4)a;<span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//downcasting</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;">       System.out.println(<span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"ok downcasting performed"</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;">    Animal a=<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;"> Dog4();  </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;">    Dog4.method(a);  </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 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 />
<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:ok downcasting performed
</pre>
</div>
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
Let's take closer look at this, actual object that is referred by a, is an object of Dog class. So if we downcast it, it is fine. But what will happen if we write:</div>
<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;">
<div class="dp-highlighter" style="margin: 8px 0px !important; overflow: hidden; padding-top: 0px; width: 845.453125px;">
<div class="bar" style="padding-left: 45px;">
<div class="tools">
</div>
</div>
<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 style="background-color: inherit; border: none; margin: 0px; padding: 0px;">Animal a=</span><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;"> Animal();  </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;">Dog.method(a);  </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="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//Now ClassCastException but not in case of instanceof operator</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">  </span></span></li>
</ol>
</div>
</div>
<h3 class="h2" style="background-color: white; color: #610b38; font-family: erdana, helvetica, arial, sans-serif; font-size: 25px; font-weight: 400; line-height: 23px;">
Understanding Real use of instanceof in java</h3>
<div style="background-color: white; font-family: verdana, helvetica, arial, sans-serif; font-size: 13px; line-height: 23px;">
Let's see the real use of instanceof keyword by the example given below.</div>
<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;">
<div class="dp-highlighter" style="margin: 8px 0px !important; overflow: hidden; padding-top: 0px; width: 845.453125px;">
<div class="bar" style="padding-left: 45px;">
<div class="tools">
</div>
</div>
<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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> A </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="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;"> a(){System.out.println(</span><span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"a method"</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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> B </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;"> b(){System.out.println(</span><span class="string" style="background-color: inherit; border: none; color: blue; margin: 0px; padding: 0px;">"b method"</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></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;"> Call{  </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;"> invoke(Printable p){</span><span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//upcasting</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 class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">if</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">(p </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">instanceof</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> A){  </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;">A a=(A)p;<span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//Downcasting </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;">a.a();  </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;">if</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;">(p </span><span class="keyword" style="background-color: inherit; border: none; color: #006699; font-weight: 700; margin: 0px; padding: 0px;">instanceof</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> B){  </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;">B b=(B)p;<span class="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//Downcasting </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;">b.b();  </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>
<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="comment" style="background-color: inherit; border: none; color: #008200; margin: 0px; padding: 0px;">//end of Call class</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;">class</span><span style="background-color: inherit; border: none; margin: 0px; padding: 0px;"> Test4{  </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;">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;">Printable p=<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;"> B();  </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;">Call c=<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;"> Call();  </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;">c.invoke(p);  </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: b method</pre>
</div>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
</div>
</div>