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From: markspace <-@.>
Newsgroups: comp.lang.java.programmer
Subject: Re: Layout Doesn't Work
Date: Wed, 08 Aug 2012 10:31:21 -0700
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On 8/8/2012 10:22 AM, clusardi2k@aol.com wrote:

>          for (int i = 0;i < 100000; i++)
>              for (int i2 = 0;i2 < 100000; i2++);
>                  for (int i3 = 0;i3 < 100000; i3++);


You can't block the EDT like this.  The loops stop the EDT from 
displaying any updates to the GUI.  Use a SwingWorker to execute tasks 
off the EDT.

<http://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html>

Reading that entire trail (Concurrency in Swing) will be a benefit to you.