如何等待在Java中完成多个任务？ [英] How to wait for completion of multiple tasks in Java?

问题描述

在Java应用程序中实现并发的正确方法是什么？我知道Threads和东西，当然，我已经为Java编程了10年了，但没有太多的并发经验。

What is the proper way to implement concurrency in Java applications? I know about Threads and stuff, of course, I have been programming for Java for 10 years now, but haven't had too much experience with concurrency.

例如，我必须异步加载一些资源，并且只有在所有已加载后，我可以继续和做更多的工作。不用说，没有订单如何完成。

For example, I have to asynchronously load a few resources, and only after all have been loaded, can I proceed and do more work. Needless to say, there is no order how they will finish. How do I do this?

在JavaScript中，我喜欢使用 jQuery.deferred p>

In JavaScript, I like using the jQuery.deferred infrastructure, to say

$.when(deferred1,deferred2,deferred3...)
 .done(
   function(){//here everything is done
    ...
   });

但是我在Java做什么？

But what do I do in Java?

推荐答案

如果我不使用parallel Streams或Spring MVC的TaskExecutor，我通常使用 CountDownLatch 。使用＃任务实例化，对于完成其任务的每个线程减少一次。 CountDownLatch.await（）等待，直到锁存器为0.真正有用。

If I'm not using parallel Streams or Spring MVC's TaskExecutor, I usually use CountDownLatch. Instantiate with # of tasks, reduce once for each thread that completes its task. CountDownLatch.await() waits until the latch is at 0. Really useful.

href =https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CountDownLatch.html =nofollow> JavaDocs

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