Java util.Timer 获取任务执行线程

Question

有没有办法获取 TimerTask 将在其上运行的线程？

public class Main {

    static Thread gameThread= null;

    public static void main(String[] args) throws Exception {
        Timer t = new Timer();

        t.schedule(new TimerTask(){
            {
                gameThread = Thread.currentThread();
                System.out.println(Thread.currentThread());//this will only give main thread back
            }
            @Override
            public void run() {
                gameThread = Thread.currentThread();//unnecessary to run every time


            }

        }, 0,15);
    }
}

我知道这会起作用，因为 run 方法会在每个例程中声明线程，但这似乎效率低下。有没有办法让任务只持续运行一次的线程？它在 TimerTask 的构造函数或初始化程序中不起作用，因为它们在主线程上运行。

Answer 1

如果您愿意使用 ScheduledExecutorService 而不是 Timer（Java Concurrency in Practice 推荐），这实际上非常简单：

public class Main {

    static Thread gameThread= null;

    public static void main(String[] args) throws Exception {
        ScheduledExecutorService service = Executors.newScheduledThreadPool(1 /*single-threaded executor service*/,
             new ThreadFactory(){
                  public Thread newThread(Runnable r){
                      gameThread = new Thread(r);
                      System.out.println(gameThread);
                      return gameThread;
                  }
        });


        service.scheduleAtFixedRate(new Runnable(){
            @Override
            public void run() {
                /*do stuff*/
            }

        }, 0,15,TimeUnit.MILLISECONDS);
    }
}

---

相关文档的链接：

• Executors#newScheduledThreadPool,
• ThreadFactory,
• ScheduledExecutorService#scheduleAtFixedRate