java线程和主线程 [英] java threads and main thread

问题描述

使主线程等到所有线程完成的最佳方法是什么？

what's the best way to make main thread to wait until all threads are finished?

for(int i=0;i<n;i++){
   Thread t=new Thread();
   t.start();

}

//wait for all threads to finish

推荐答案

创建一个列表并等待所有。

Create a list and wait for the all.

List<Thread> threads = new ArrayList<Thread>();
for(int i=0;i<n;i++){
    Thread t=new Thread();
    t.start();
    threads.add(t);
}

for(Thread t: threads) t.join();

然而，使用ExecutorService可以更好地处理线程池。

However using an ExecutorService can be a more elegant way to handle a pool of threads.

ExecutorService es = Executors.newCachedThreadPool();
for(int i=0;i<n;i++)
   es.submit(new Task(n));
es.shutdown();
es.awaitTermination(timeout, TimeUnit.SECONDS);

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