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    <p>As far as I know, Java has no analogous structure to the <code>WaitHandle.WaitAny</code> method.</p> <p>It seems to me that this could be achieved through a "WaitableFuture" decorator:</p> <pre><code>public WaitableFuture&lt;T&gt; extends Future&lt;T&gt; { private CountDownLatch countDownLatch; WaitableFuture(CountDownLatch countDownLatch) { super(); this.countDownLatch = countDownLatch; } void doTask() { super.doTask(); this.countDownLatch.countDown(); } } </code></pre> <p>Though this would only work if it can be inserted before the execution code, since otherwise the execution code would not have the new <code>doTask()</code> method. But I really see no way of doing this without polling if you cannot somehow gain control of the Future object before execution.</p> <p>Or if the future always runs in its own thread, and you can somehow get that thread. Then you could spawn a new thread to join each other thread, then handle the waiting mechanism after the join returns... This would be really ugly and would induce a lot of overhead though. And if some Future objects don't finish, you could have a lot of blocked threads depending on dead threads. If you're not careful, this could leak memory and system resources.</p> <pre><code>/** * Extremely ugly way of implementing WaitHandle.WaitAny for Thread.Join(). */ public static joinAny(Collection&lt;Thread&gt; threads, int numberToWaitFor) { CountDownLatch countDownLatch = new CountDownLatch(numberToWaitFor); foreach(Thread thread in threads) { (new Thread(new JoinThreadHelper(thread, countDownLatch))).start(); } countDownLatch.await(); } class JoinThreadHelper implements Runnable { Thread thread; CountDownLatch countDownLatch; JoinThreadHelper(Thread thread, CountDownLatch countDownLatch) { this.thread = thread; this.countDownLatch = countDownLatch; } void run() { this.thread.join(); this.countDownLatch.countDown(); } } </code></pre>
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