java线程间通信（wait、notfiy）

Thread1中使用wait语句，等待Thread2执行完notify之后，并将synchronized语句块执行完，释放锁之后，Thread1得到重新执行的机会，接着执行下去。

public class Thread1 extends Thread {

    private Object lock;

    public Thread1(Object lock) {

        super();

        this.lock = lock;

    }

    @Override

    public void run() {

        try {

        synchronized (lock) {

        System.out.println("wait start=" + System.currentTimeMillis());

        lock.wait();

        System.out.println("wait end=" + System.currentTimeMillis());

        }

        } catch (InterruptedException e){

        e.printStackTrace();

        }

    }

}

public class Thread2 extends Thread {

    private Object lock;

    public Thread2(Object lock) {

        super();

        this.lock = lock;

    }

    @Override

    public void run() {

        try {

        synchronized (lock) {

        System.out.println("notify start=" + System.currentTimeMillis());

        lock.notify();

        System.out.println("notify end=" + System.currentTimeMillis());

        }

        } catch (InterruptedException e){

        e.printStackTrace();

        }

    }

}

public class Test {

public static void main(String[] args) {

try {

Object lock = new Object();

Thread1 t1 = new Thread1(lock);

t1.start();

Thread2 t2 = new Thread2(lock);

t2.start();

} catch(InterruptedException e) {

e.printStackTrace();

}

}

}

打印结果:

wait start=……

notify start=……

notify end=……

wait end=……