Java:如何使用Thread.join

Question

我是线程的新手.我怎样才能开始t.join工作,调用它的线程会等到t执行完毕？

这段代码只会冻结程序,因为线程正在等待自己死掉,对吧？

public static void main(String[] args) throws InterruptedException {
    Thread t0 = new Thready();
    t0.start();

}

@Override
public void run() {
    for (String s : info) {
        try {
            join();
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.printf("%s %s%n", getName(), s);
    }   
}

如果我想要有两个线程,我会怎么做,其中一个线程打印出一半的info数组,然后在完成剩下的工作之前等待另一个完成？

Answer 1

使用这样的东西:

public void executeMultiThread(int numThreads)
   throws Exception
{
    List threads = new ArrayList();

    for (int i = 0; i < numThreads; i++)
    {
        Thread t = new Thread(new Runnable()
        {
            public void run()
            {
                // do your work
            }
        });

        // System.out.println("STARTING: " + t);
        t.start();
        threads.add(t);
    }

    for (int i = 0; i < threads.size(); i++)
    {
        // Big number to wait so this can be debugged
        // System.out.println("JOINING: " + threads.get(i));
        ((Thread)threads.get(i)).join(1000000);
    }