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    <p>There are a number of important concepts you seem to be missing.</p> <ol> <li>Swing is an event driven environment. That means that there is no means (or at least only a very few) that you can "wait" for user input, typically, you just need to react to their interaction.</li> <li>Swing is driven by a single thread, known as the Event Dispatching Thread (AKA EDT). It is the responsibility of this thread to dispatch/process events coming into the application to the appropriate parts of the application so that they can take action.</li> <li>The repaint manager posts its update requests onto the EDT.</li> </ol> <p>ANY action you take that stops the EDT from carrying out this work will make your application look like it's hung.</p> <p>You must NEVER carry out any time consuming operations (such as I/O, loops or <code>Thread#sleep</code> for example) on the EDT, doing so will make your application "pause", which is never pretty.</p> <p>Have a read through <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html" rel="nofollow noreferrer">Concurrency in Swing</a> for more information.</p> <p>Now, you have a number of choices. You could use a <code>Thread</code> to "wait" in the background and turn the cards back or you could use a <code>SwingWorker</code> or a <code>javax.swing.Timer</code>.</p> <p>The other problem you have, is that you should NEVER update any UI components from any <code>Thread</code> other than the EDT. This means if you were to use a <code>Thread</code>, you would become responsible for re-syncing that thread with the EDT. While not difficult, it just becomes messy.</p> <p><code>SwingWorker</code> and <code>javax.swing.Timer</code> have functionality that make this much easier.</p> <p>Threads and <code>SwingWorker</code> are great for performing background processing and would simply be overkill for this problem. Instead, a <code>javax.swing.Timer</code> would fit perfectly here.</p> <pre><code>if (!Control.model.twoCardsTurned) { if ("unturn".equals(action)) { new Timer(1000, new ActionListener() { public void actionPerformed(ActionEvent evt) { keypadArray[pos].setIcon(back); keypadArray[Control.model.lastCard].setIcon(back); System.out.println("Card: "+pos+" unset"); System.out.println("Card: "+Control.model.lastCard+" unset"); } }).start(); } } </code></pre> <p>This is a really simple example. You might like to put in some controls that will prevent the user from clicking anything until the timer fires, for example ;)</p>
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    1. COThanks again, very helpful and very informative answer. I'll have to do some more reading on the basic concepts of swing
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