实现两线程的同步一（wait/notify）

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1、使用Object的wait和notify

public class WaitAndNotifyDemo {

    public static void main(String[] args) throws InterruptedException {

        MThread mThread = new MThread();

        synchronized (mThread) {

            try {

                mThread.start();

                // 主线程睡眠3s

                Thread.sleep(3000);

                System.out.println("before wait");

                // 阻塞主线程

                mThread.wait();

                System.out.println("after wait");

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

    }

}

class MThread extends Thread {

    public void run() {

        synchronized (this) {

            System.out.println("before notify");

            notify();

            System.out.println("after notify");

        }

    }

}