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    <blockquote> <p>Can anyone tell me why sleeping one thread is stopping my whole execution</p> </blockquote> <p>to better explain your Swing GUI is created on its own <em>special thread</em> separate from that which <code>main()</code> and other code will run in, this is done via creating your Swing components in the <code>SwingUtilities.invokeXXX</code> block (even if you have not done this your GUI will be run on a single thread called the <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html">initial thread</a>) . Now if you simply call <code>sleep</code> while on <code>Event Dispatch Thread</code> (or for that matter on the same <code>Thread</code>) it will wait for the call to <code>Thread.sleep</code> to finish. Now because all Swing events are processed on EDT we pause its execution by calling <code>sleep(..)</code> thus pausing the UI events from being processed and therefore GUI is frozen (until <code>sleep(..)</code> returns).</p> <p>You should not use <code>Thread.sleep(..)</code> on <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/dispatch.html"><code>Event Dispatch Thread</code></a> (or any <code>Thread</code> where sleep will cuase unwanted execution blocking), as this will cause the UI to seem frozen. </p> <p><a href="http://foxtrot.sourceforge.net/docs/freeze.php">Here</a> is a nice example which demonstrates exactly, this unwanted behavior caused by invoking <code>Thread.sleep(..)</code> on GUI's EDT.</p> <p>Rather use:</p> <ul> <li><p><a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/timer.html">Swing Timer</a> for example:</p> <pre><code>int delay=1000;// wait for second Timer timer = new Timer(delay, new AbstractAction() { @Override public void actionPerformed(ActionEvent ae) { //action that you want performed } }); //timer.setRepeats(false);//the timer should only go off once timer.start(); </code></pre></li> <li><p><a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html">Swing Worker</a></p></li> </ul> <p>or if no Swing components are being created/modified:</p> <ul> <li><p><a href="http://docs.oracle.com/javase/7/docs/api/java/util/TimerTask.html">TimerTask</a></p></li> <li><p><a href="http://docs.oracle.com/javase/tutorial/essential/concurrency/runthread.html">Thread</a>, you would then use <code>Thread.sleep(int milis)</code> (but thats last option in any case IMO)</p></li> </ul> <p><strong>UPDATE</strong></p> <p><code>Swing Timer</code>/<code>SwingWorker</code> was only added in Java 1.6, however, <code>TimerTask</code> and <code>Thread</code> have been around for alot longer sine Java 1.3 and JDK 1 repsectively, thus you could even use either of the 2 above methods and wrap calls that create/manipulate Swing components in <code>SwingUtilities/EventQueue#invokeXX</code> block; thats the way things used to be done :P</p>
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    1. USDavid Kroukamp
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    1. COthank you so much, Swing Timer worked perfectly and my program is running with far less clutter. thanks again
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      1. USHarper
 

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