实现两线程的同步一（wait/notify）

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3sThread.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");    }}
}

运行结果：
before wait
before notify
after notify
after wait
两线程执行图序：