等待多个线程在Java中完成 [英] Waiting on multiple threads to complete in Java

问题描述

在程序执行过程中，会启动许多线程。线程数量取决于用户定义的设置，但它们都使用不同的变量执行相同的方法。

During the course of my program execution, a number of threads are started. The amount of threads varies depending on user defined settings, but they are all executing the same method with different variables.

在某些情况下，执行期间需要清理，这部分是停止所有线程，我不希望它们立即停止，我只是设置一个他们检查的变量来终止它们。问题是它可以在线程停止前最多1/2秒。但是，我需要确保在清理可以继续之前所有线程都已停止。清理是从另一个线程执行的，所以从技术上来说我需要这个线程来等待其他线程完成。

In some situations, a clean up is required mid execution, part of this is stopping all the threads, I don't want them to stop immediately though, I just set a variable that they check for that terminates them. The problem is that it can be up to 1/2 second before the thread stops. However, I need to be sure that all threads have stopped before the clean up can continues. The cleanup is executed from another thread so technically I need this thread to wait for the other threads to finish.

我想到了几种方法，但它们都是似乎过于复杂。我希望有一些方法可以等待一组线程完成。这样的事情是否存在？

I have thought of several ways of doing this, but they all seem to be overly complex. I was hoping there would be some method that can wait for a group of threads to complete. Does anything like this exist?

谢谢。

推荐答案

加入它们一个接一个：

for (Thread thread : threads) {
  thread.join();
}

（你需要用做一些事情InterruptedException ，如果出现问题，您可能希望提供超时，但这是基本想法......）

(You'll need to do something with InterruptedException, and you may well want to provide a time-out in case things go wrong, but that's the basic idea...)

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