class xx extends Thread{
     public void run(){
      Thread.sleep(1000)  //线程休眠1000毫秒，sleep使线程进入Block状态，并释放资源
    }}

class MyThread implements Runnable {
  
  private String name;
  
  public MyThread(String name) {
    super();
    this.name = name;
  }
  
  @Override
  public void run() {
    for(int i = 0 ; i < 200; i++) {
      System.out.println("Thread"+name+"--->"+i);
    }  
  }
}

public class ThreadDemo {

  public static void main(String[] args) {
    MyThread a = new MyThread("a");
    MyThread b = new MyThread("b");
    MyThread c = new MyThread("c");
    new Thread(a).start();
    new Thread(b).start();
    new Thread(c).start();
  }
}

class TaskWithResult implements Callable<String> {
 private int id;

 public TaskWithResult(int id) {
 this.id = id;
 }

 @Override
 public String call() throws Exception {
 return "result of TaskWithResult " + id;
 }
}

public class CallableTest {
 public static void main(String[] args) throws InterruptedException,
  ExecutionException {
 ExecutorService exec = Executors.newCachedThreadPool();
 ArrayList<Future<String>> results = new ArrayList<Future<String>>(); //Future 相当于是用来存放Executor执行的结果的一种容器
 for (int i = 0; i < 10; i++) {
  results.add(exec.submit(new TaskWithResult(i)));
 }
 for (Future<String> fs : results) {
  if (fs.isDone()) {
  System.out.println(fs.get());
  } else {
  System.out.println("Future result is not yet complete");
  }
 }
 exec.shutdown();
 }
}