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    <blockquote> <p>The problem occur when while there's more than two active thread in system. the threads which are waiting won't wake up!</p> </blockquote> <p>Well how would you expect them to? You're only ever notifying the "current" object, which is a new thread. When one thread finishes, it will call <code>this.notifyAll</code>, but that won't wake up <em>other</em> threads.</p> <p>Additionally, I would <em>strongly</em> urge you to change other things about how you're writing this:</p> <ul> <li>An anonymous inner class of this size is crying out to be broken out into a proper named class</li> <li>The <code>ApplySetting</code> method name doesn't follow Java naming conventions. Ditto various of your variable names.</li> <li>It's generally a bad idea to extend <code>Thread</code> - implement <code>Runnable</code> instead, and pass the <code>Runnable</code> to the thread constructor</li> <li>You shouldn't call <code>wait</code> and <code>notify</code>/<code>notifyAll</code> on <code>Thread</code> objects, as <code>Thread</code> uses that for signalling itself</li> <li>It's generally a good idea to synchronize on private references which <em>no</em> other code is going to use for synchronization or signalling</li> <li>As noted in Marko's answer, it's almost always a bad idea to make the <code>run</code> method synchronized. Given the previous bullet point, I prefer not to make any whole <em>methods</em> synchronized, instead synchronizing on individual references within methods</li> <li>It looks like you're trying to update UI elements within a non-UI thread; I believe that will fail. (You need to use <code>invokeLater</code>)</li> </ul>
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    1. POThread won't wake up
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    1. USJon Skeet
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    1. COI do plan to update UI elements. a button invoke this applySetting method. I don't want my GUI to freeze that's why I used thread class. This is my first multithread coding and at the same time my first java coding experience. i just wanted to learn the logic before making it neat.
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    2. CO@Elham: It's fine to use threads, but you shouldn't be accessing UI elements *directly* in that thread. It would be better to fetch all the information you need from the UI (desired and current temperature, for example) before you start, then create the thread to use those, then use `SwingUtilities.invokeLater` to update the UI when you need to. Alternatively, do *everything* in the UI thread, but use a timer instead of `Thread.sleep`
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    3. COA good option is to use `SwingWorker` instead of raw threads. There you already have been provided with a method that runs in its own thread and another method that runs after that in the GUI thread.
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      1. USMarko Topolnik
 

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