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    <blockquote> <p>when i try to run addSomeComponentsToFrame method, frame appears(as black rectangle) but freezes and after runOtherTask method completes it shows frame's components on screen.</p> </blockquote> <p>Sounds like you are blocking the <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/dispatch.html" rel="nofollow noreferrer"><code>Event Dispatch Thread</code></a> with a long running task.</p> <p>You might want to offload that task from your EDT to a separate <em>thread</em>:</p> <p>If you manipulate Swing components in <code>runOtherTask</code> better to use :</p> <ul> <li><a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html" rel="nofollow noreferrer">Swing Worker</a> (see <a href="https://stackoverflow.com/questions/12641887/swingworker-in-java/12642215#12642215">this</a> example)</li> <li><a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/timer.html" rel="nofollow noreferrer">Swing Timer</a> (see <a href="https://stackoverflow.com/questions/14074329/using-sleep-for-a-single-thread/14074427#14074427">this</a> example)</li> </ul> <p>Otherwise you can use (Note the below does not run in the GUIs <code>Event Dispatch Thread</code> thus manipulating Swing components in them is not allowed):</p> <ul> <li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html" rel="nofollow noreferrer">Thread</a> </li> <li><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Timer.html" rel="nofollow noreferrer">Timer/TimerTask</a> (See <a href="https://stackoverflow.com/questions/11707066/timer-in-java-thread/11707987#11707987">this</a> example)</li> </ul> <p>Just as a side note no need for:</p> <pre><code>frame.getContentPane().validate(); frame.getContentPane().repaint(); </code></pre> <p>simply:</p> <pre><code>frame.validate(); frame.repaint(); </code></pre> <p>Also if your java version allows use <code>revalidate()</code> instead of <code>validate()</code>. But these are only necessary if adding/removing a component from a visible container.</p>
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