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java线程中的notifyAll唤醒操作

注意:

java中的notifyAll和notify都是唤醒线程的操作,notify只会唤醒等待池中的某一个线程,但是不确定是哪一个线程,notifyAll是针对指定对象里面的所有线程执行唤醒操作,指定对象一旦唤醒成功。则会立即加入线程的资源争夺中去。

例如:

package TestThread.ThreadSynchronized;

public class TestWaitAll {
    public static void main(String[] args) {
        Test1 test1 = new Test1();
        Thread t = new Thread(test1, "线程1");
        Thread t1 = new Thread(test1, "线程2");
        Thread t2 = new Thread(test1, "线程3");
        Test2 test2 = new Test2(test1, "唤醒线程");
        t.start();
        t1.start();
        t2.start();
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        test2.start();
    }
}

class Test1 implements Runnable {
    public void run() {
        synchronized (this) {
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + "当前没有被执行到!");
        }
    }
}

class Test2 extends Thread {
    private Test1 test1;
    String name;

    public Test2(Test1 test1, String name) {
        super(name);
        this.name = name;
        this.test1 = test1;
    }

    public void run() {
        synchronized (test1) {
            test1.notifyAll();// 针对当前对象执行唤醒所有线程的操作
            System.out.println(Thread.currentThread().getName() + ":唤醒线程执行成功!");
        }
    }
}

 执行结果为:

 

posted on 2017-03-24 10:27  温柔的鲨鱼  阅读(1373)  评论(0编辑  收藏  举报

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