最简实例说明wait、notify、notifyAll的使用方法

最新推荐文章于 2022-11-22 19:40:55 发布

转载最新推荐文章于 2022-11-22 19:40:55 发布 · 394 阅读

本文通过一个具体的Java示例展示了如何使用synchronized关键字和wait/notifyAll方法来实现线程间的同步，确保线程安全地访问共享资源。

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public class NotifyTest {
    private String flag[] = { "true" };

    class NotifyThread extends Thread {
        public NotifyThread(String name) {
            super(name);
        }

        public void run() {
            try {
                sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (flag) {
                flag[0] = "false";
                 flag.notifyAll();
            }
        }
    };

    class WaitThread extends Thread {
        public WaitThread(String name) {
            super(name);
        }

        public void run() {
            synchronized (flag) {
                while (flag[0] != "false") {
                    System.out.println(getName() + " begin waiting!");
                     long waitTime = System.currentTimeMillis();
                    try {
                         flag.wait();

                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    waitTime = System.currentTimeMillis() - waitTime;
                    System.out.println("wait time :" + waitTime);
                }
                System.out.println(getName() + " end waiting!");
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {
        System.out.println("Main Thread Run!");
        NotifyTest test = new NotifyTest();
        NotifyThread notifyThread = test.new NotifyThread("notify01");
        WaitThread waitThread01 = test.new WaitThread("waiter01");
        WaitThread waitThread02 = test.new WaitThread("waiter02");
        WaitThread waitThread03 = test.new WaitThread("waiter03");
        notifyThread.start();
        waitThread01.start();
        waitThread02.start();
        waitThread03.start();
    }

}