如何等待多个线程完成? [英] How to wait for a number of threads to complete?

问题描述

简单地等待所有线程进程完成的方法是什么?例如，假设我有:

What is a way to simply wait for all threaded process to finish? For example, let's say I have:

public class DoSomethingInAThread implements Runnable{

    public static void main(String[] args) {
        for (int n=0; n<1000; n++) {
            Thread t = new Thread(new DoSomethingInAThread());
            t.start();
        }
        // wait for all threads' run() methods to complete before continuing
    }

    public void run() {
        // do something here
    }


}

我如何改变它，以便 main() 方法在注释处暂停，直到所有线程的 run() 方法退出?谢谢！

How do I alter this so the main() method pauses at the comment until all threads' run() methods exit? Thanks!

推荐答案

你把所有线程放在一个数组中，启动它们，然后循环

You put all threads in an array, start them all, and then have a loop

for(i = 0; i < threads.length; i++)
  threads[i].join();

每个连接都会阻塞，直到相应的线程完成.线程的完成顺序可能与您加入它们的顺序不同，但这不是问题:当循环退出时，所有线程都已完成.

Each join will block until the respective thread has completed. Threads may complete in a different order than you joining them, but that's not a problem: when the loop exits, all threads are completed.

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