java - 如果线程在设定的时间段后尚未完成，这是停止线程的正确方法吗？

Question

public class TimeToDieThread extends Thread implements Runnable
{
    private Runnable r;
    private long lTimeLength;//time NanoTime

    public TimeToDieThread(Runnable r, long lTimeLength)
    {
        super();
        this.r = r;
        this.lTimeLength = lTimeLength;
    }
    public void start() {
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                boolean bran = false;
                while ((!Thread.currentThread().isInterrupted()) && (bran == false)) {
                    r.run();
                    bran = true;
                }
            }
        });
        t.start();
        // Sleep a for entire length, and then interrupt
        try
        {
            Thread.sleep(lTimeLength);
        } catch (InterruptedException e)
        {
            System.out.println("Interrupted, wop wop waa");
        }
        t.interrupt();
    }
}

Answer 1

很少需要直接使用Thread(并且绝对没有必要扩展Thread并实现Runnable，因为Thread 已经实现了 Runnable)。

使用 ExecutorService，向其提交一个 Runnable，然后在返回的 上使用 get(long, TimeUnit) 方法Future 等待它完成。

// Construct this somewhere. Note that you also need to shut it down somewhere.
// This is just an example of how you might construct it; other executors are
// available.
ExecutorService executorService = Executors.newFixedThreadPool(nThreads);

Future<?> future = executorService.submit(yourRunnable);
future.get(timeout, timeoutUnit);  // Exception handling omitted.
// Cancel if it is still running.
future.cancel(true);