public class ThreadPrint{
    private  int a = 0;
    private   final Object lock = new Object();
    public  void turning() throws InterruptedException{
        new Thread (new printNum(), "线程1").start();
        Thread.sleep(100);
        new Thread (new printNum(), "线程2").start();
    }
    class printNum implements Runnable{
        @Override
        public void run() {
            // TODO Auto-generated method stub
            while (a <= 100) {
                   synchronized (lock) {
                       System.out.println(Thread.currentThread().getName()+ ": " + a++);
                       lock.notifyAll();
                       try {
                           // 如果还没有结束，则让出当前的锁并休眠
                           if (a <= 100) {
                               lock.wait();
                           }
                       } catch (InterruptedException e) {
                           e.printStackTrace();
                       }
                   }
               }
        }
    }
    public static void main(String[] args) throws InterruptedException{
        new ThreadPrint().turning();
        
    }
    
}