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    <p>It would behoove you to learn about <code>SwingWorker</code> which gives you ultimate flexibility when it comes to threading. Here's the short and skinny:</p> <p>All GUI actions should be on the <code>Event Dispatch Thread</code> (EDT for short). All time-consuming tasks should be on background threads. SwingWorker allows you to control which thread you're running code on.</p> <p>First, to run anything on the EDT, you use this code:</p> <pre><code>SwingUtilities.invokeLater(new Runnable() { @Override public void run() { jLabel1.setText("Yay I'm on the EDT."); } }); </code></pre> <p>But if you want to run a time-consuming task, that won't do what you need. Instead, you'll need a SwingWorker like this:</p> <pre><code>class Task extends SwingWorker&lt;Void, Void&gt; { public Task() { /* * Code placed here will be executed on the EDT. */ jLabel1.setText("Yay I'm on the EDT."); execute(); } @Override protected Void doInBackground() throws Exception { /* * Code run here will be executed on a background, "worker" thread that will not interrupt your EDT * events. Run your time consuming tasks here. * * NOTE: DO NOT run ANY Swing (GUI) code here! Swing is not thread-safe! It causes problems, believe me. */ return null; } @Override protected void done() { /* * All code run in this method is done on the EDT, so keep your code here "short and sweet," i.e., not * time-consuming. */ if (!isCancelled()) { boolean error = false; try { get(); /* All errors will be thrown by this method, so you definitely need it. If you use the Swing * worker to return a value, it's returned here. * (I never return values from SwingWorkers, so I just use it for error checking). */ } catch (ExecutionException | InterruptedException e) { // Handle your error... error = true; } if (!error) { /* * Place your "success" code here, whatever it is. */ } } } } </code></pre> <p>Then you need to launch your SwingWorker with this:</p> <pre><code>new Task(); </code></pre> <p>For more info, check out Oracle's documentation: <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html" rel="nofollow">http://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html</a></p>
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    1. COa swingworker can be started (aka: calling its execute) from any thread, no need to wrap that into an invokeLater
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    2. COAwesome answer. Thank you :)
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    3. CO@kleopatra, I always wondered that, I just assumed it needed EDT. Good to know. Thanks.
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