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copied!<p>Sounds like you want <code><a href="http://download.oracle.com/javase/6/docs/api/java/util/concurrent/ExecutorService.html#invokeAll%28java.util.Collection%29" rel="noreferrer">ExecutorService.invokeAll</a></code>, which will return results from worker threads in a fixed order, even though they may be scheduled in arbitrary order:</p> <pre><code>import java.util.ArrayList; import java.util.List; import java.util.concurrent.Callable; import java.util.concurrent.ExecutionException; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.Future; public class ThreadOrdering { static int NUM_THREADS = 10; public static void main(String[] args) { ExecutorService exec = Executors.newFixedThreadPool(NUM_THREADS); class MyCallable implements Callable<Integer> { private final int threadnumber; MyCallable(int threadnumber){ this.threadnumber = threadnumber; } public Integer call() { System.out.println("Running thread #" + threadnumber); return threadnumber; } } List<Callable<Integer>> callables = new ArrayList<Callable<Integer>>(); for(int i=1; i<=NUM_THREADS; i++) { callables.add(new MyCallable(i)); } try { List<Future<Integer>> results = exec.invokeAll(callables); for(Future<Integer> result: results) { System.out.println("Got result of thread #" + result.get()); } } catch (InterruptedException ex) { ex.printStackTrace(); } catch (ExecutionException ex) { ex.printStackTrace(); } finally { exec.shutdownNow(); } } } </code></pre>

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