public class T {        private static int a =1;//1代表线程1 2线程2        public static void main(String[] args) {                final T t = new T();                new Thread(new Runnable() {                        @Override            public void run() {                synchronized (t) {                    for(int i=1;i<=10;i++){                        if(i==6){                                try {                                    a=2;//切换线程2                                    t.wait();//线程1等待,并释放了对象的锁                                } catch (Exception e) {                                    e.printStackTrace();                                }                            }                        System.out.println(Thread.currentThread().getName()+":"+i);                    }                                                            }            }        }).start();;                new Thread(new Runnable(){            @Override            public void run() {                synchronized (t) {                    if(a!=2){
   //没有轮到，进入等待                        try {                            t.wait();                        } catch (InterruptedException e) {                            e.printStackTrace();                        }                    }                    System.out.println("hello");                    t.notifyAll();                    }                            }                    }).start();    }        }

 结果如下：

Thread-0:1

Thread-0:2

Thread-0:3

Thread-0:4

Thread-0:5

Thread-1:hello

Thread-0:6

Thread-0:7

Thread-0:8

Thread-0:9

Thread-0:10