public class StateStopTask implements Runnable{
     private static volatile boolean isCancled = false;
     public void run() {
          while(true) {
               if(isCancled == true) {
                    System.out.println("StateStopTask is stop");
                    return;
               }
          }
     }

     public static void main(String []args) {
          new Thread(new StateStopThread()).start();
          Thread.sleep(3000);
          isCancled = true;
     }
}

public class StateStopTask implements Runnable{
     public void run() {
          while(!Thread.currentThread().isInterrupted()) {
                System.out.println("StateStopTask is running");
          }
          System.out.println("StateStopTask is stopping");
     }
     public static void main(String []args) {
          Thread t = new Thread(new StateStopThread()).start();
          Thread.sleep(3000);
          t.interrupt();
     }
}

1. 通过调用sleep(milliseconds)使任务进入休眠状态，在这种情况下，任务在指定的时间内不会运行。
2. 你可以通过wait()使线程挂起。直到线程得到了notify()或notifyAll()消息(或者在JavaSE5的java.util.concurrent类库中等价的signal()或signalAll()消息)，线程才会进入就绪状态。
3. 任务在等待某个输入输出完成。
4. 任务试图在某个对象上调用其同步控制方法，但是对象锁不可用，因为另一个任务已经获取了这个锁。

public class InterruptedTask implements Runnable{
     public void run() {
          while(!Thread.currentThread().interrupted()) {
               try {
                    System.out.println("InterruptedTask running");
                    Thread.sleep(100);     
               } catch (InterruptedException e) {
                    System.out.println("interrupted by InterruptedException ")
               }     
          }
          System.out.println("InterruptedTask Interrupted")

     }
}