黑马程序员-Callable与Future

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CompletionService可以用来提交一组Callable任务，其take方法返回已完成的一个Callable任务对应的Future对象

ScheduledExecutorService ses = Executors.newScheduledThreadPool(3);CompletionService<String> completionService = new ExecutorCompletionService<String>(ses);for (int i = 0; i < 10; i++) {final int task = i;completionService.submit(new Callable<String>() {@Overridepublic String call() throws Exception {// TODO Auto-generated method stubThread.currentThread().sleep(20);return task + "";}});}for (int i = 0; i < 10; i++) {try {String data = completionService.take().get();System.out.println(data);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}

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