java Worker类怎么用？

private final class Worker

  extends AbstractQueuedSynchronizer

  implements Runnable{

    /**

     * This class will never be serialized, but we provide a

     * serialVersionUID to suppress a javac warning.

     */

    private static final long serialVersionUID = 6138294804551838833L;

    /** Thread this worker is running in.  Null if factory fails. */

   // 执行任务的线程

    final Thread thread;

    /** Initial task to run.  Possibly null. */

   // 执行的任务

    Runnable firstTask;

    /** Per-thread task counter */

    volatile long completedTasks;

    /**

     * Creates with given first task and thread from ThreadFactory.

     * @param firstTask the first task (null if none)

     */

    Worker(Runnable firstTask) {

      // 新建线程的时候，设置state -1 是为了防止线程还未执行时（线程只有在执行的时候才会被中断），就被     // 其它线程显式调用shutdown方法中断了，因为中断是要判断state大于等于0才会中断

      setState(-1);

      this.firstTask = firstTask;

      // 新建了一个线程

      this.thread = getThreadFactory().newThread(this);

    }

    /** Delegates main run loop to outer runWorker  */

    public void run() {

        runWorker(this);

    }