wait、sleep、notify、notifyAll的区别

来源：互联网发布：51recovery数据恢复编辑：程序博客网时间：2024/05/29 07:47

public class Test {

    public static void main(String[] args) throws Exception {
        final Object lock="";
        Thread t1=new Thread(){
            public void run(){
                try {
                   System.out.println("t1 wait begin");
                    synchronized (lock) {
                       System.out.println("t1 get lock, wait begin");
                        lock.wait();
                        System.out.println("t1 wait end,release lock");
                        lock.notifyAll();
                    }
                    System.out.println("t1 wait end");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };

        t1.start();
        System.out.println("t1 start and sleep");
        for(int i=0;i<10000001;i++){
           if(i==10000000)
               System.out.println("i end");
        }
        Thread.sleep(5000);
        System.out.println("sleep(5000) end");

        System.out.println("main lock begin");
        synchronized (lock) {
           System.out.println("main get lock");
            lock.notify();
            System.out.println("notify");
            Thread.sleep(10000);
            System.out.println("sleep 10000 end");
            System.out.println("main wait begin ");
            lock.wait();
            System.out.println("main wait end");
        }
        System.out.println("main lock end");
    }

}

sleep()用于暂时停止一个线程的执行， wait()方法的作用是让当前线程释放其所持有的"对象互斥锁"，进入wait队列(等待队列)；而notify()/notifyAll方法的作用是唤醒一个或所有正在等待队列中等待的线程，并将它（们）移入等待同一个"对象互斥锁"的队列。

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