java 多线程& notify()方法：不立即释放锁——70

package chapter3.test3_1.test3_1_11;

public class MyService {
    private Object lock = new Object();

    public void waitMethod() {
        try {
            synchronized (lock) {
                System.out.println("begin wait() ThreadName=" + Thread.currentThread().getName() + " time=" + System.currentTimeMillis());
                lock.wait();
                System.out.println(" end wait() ThreadName=" + Thread.currentThread().getName() + " time=" + System.currentTimeMillis());
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public void notifyMethod() {
        try {
            synchronized (lock) {
                System.out.println("begin notify() ThreadName=" + Thread.currentThread().getName() + " time=" + System.currentTimeMillis());
                lock.notify();
                Thread.sleep(5000);
                System.out.println(" end notify() ThreadName=" + Thread.currentThread().getName() + " time=" + System.currentTimeMillis());
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

package chapter3.test3_1.test3_1_11;

public class MyThreadA extends Thread {
    private MyService myService;

    public MyThreadA(MyService myService) {
        super();
        this.myService = myService;
    }

    @Override
    public void run() {
        myService.waitMethod();
    }
}

package chapter3.test3_1.test3_1_11;

public class MyThreadB extends Thread {
    private MyService myService;

    public MyThreadB(MyService myService) {
        super();
        this.myService = myService;
    }

    @Override
    public void run() {
        myService.notifyMethod();
    }
}

package chapter3.test3_1.test3_1_11;

public class Test {
    public static void main(String[] args) throws InterruptedException {
        MyService myService = new MyService();
        MyThreadA a = new MyThreadA(myService);
        a.start();
        Thread.sleep(50);
        MyThreadB b = new MyThreadB(myService);
        b.start();
    }
}

notify()方法执行后锁不释放 

通过对控制台输出的时间的分析，可以总结出：必须 执行完 notify() 方法所在的同步 synchronized代码块后才释放锁。