java----wait/notify

解释

　　wait/notify必须配合synchronized使用

demo

class NotifyStop2 {
    private final Object lock = new Object();

    public void add(String s) throws InterruptedException {
        Thread.sleep(1000);
        synchronized (lock) {
            System.out.println("add notify qian");
            //唤醒其他线程,但是其他线程不能执行,因为lock这把锁,还是被我占用的
            lock.notify();
            System.out.println("add notify hou");
            try {
                Thread.sleep(5000);
                System.out.println("add wait qian");
                //释放lock锁,其他线程可以执行了【使用wait释放锁，或者方法执行完毕，也是释放锁】
                lock.wait();
                System.out.println("add wait hou");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }

    public void get() throws InterruptedException {
        synchronized (lock) {
            try {
                System.out.println("get wait qian");
                lock.wait();
                System.out.println("get wait hou");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("get notify qian");
            lock.notify();
            Thread.sleep(5000);
            System.out.println("get notify hou");
        }
    }

    public static void main(String[] args) {
        NotifyStop2 notifyStop2 = new NotifyStop2(); //特别注意使用同一个对象进行调用
        new Thread(() -> {
            try {
                notifyStop2.add("abc");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }, "t1").start();
        new Thread(() -> {
            try {
                notifyStop2.get();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }, "t2").start();
    }
}