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You can use JOptionPane.showMessageDia<wbr />log()
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You can use JOptionPane.showMessageDialog()

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Different examples at <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/dialog.html" rel="ugc">http://java.sun.com/docs/books/tutorial/uiswing/components/dialog.html</a><br />
<br />
But<br />
&nbsp;<br />
&nbsp; &nbsp; &nbsp;JOptionPane.showMessageDia<wbr />log(new JFrame(), &quot;Hello world!&quot;);<br />
<br />
just works
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Different examples at http://java.sun.com/docs/books/tutorial/uiswing/components/dialog.html [http://java.sun.com/docs/books/tutorial/uiswing/components/dialog.html]

But
 
     JOptionPane.showMessageDialog(new JFrame(), "Hello world!");

just works

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<div class="content wysiwyg-content">
I need to create a popup in a Jtable, when the mouse is clicked on a cell in a jtable, a popup needs to be displayed. &nbsp;I am unfamilar with creating a popup.
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I need to create a popup in a Jtable, when the mouse is clicked on a cell in a jtable, a popup needs to be displayed.  I am unfamilar with creating a popup.

How to Create popup in Jtable?

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.