Java多线程wait()和notify()方法详细图解

private static class WaitTask implements Runnable {
        private Object lock;
        public WaitTask(Object lock) {
            this.lock = lock;
        }
        @Override
        public void run() {
            synchronized (lock) {
                System.out.println(Thread.currentThread().getName() + "准备进入等待状态");
                // 此线程在等待lock对象的notify方法唤醒
                try {
                    lock.wait();
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                System.out.println(Thread.currentThread().getName() + "等待结束，本线程继续执行");
            }
        }
    }

private static class WaitTask implements Runnable {
        private Object lock;
        public WaitTask(Object lock) {
            this.lock = lock;
        }
        @Override
        public void run() {
            synchronized (lock) {
                System.out.println(Thread.currentThread().getName() + "准备进入等待状态");
                // 此线程在等待lock对象的notify方法唤醒
                try {
                    lock.wait();
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                System.out.println(Thread.currentThread().getName() + "等待结束，本线程继续执行");
            }
        }
    }
    private static class NotifyTask implements Runnable {
        private Object lock;
        public NotifyTask(Object lock) {
            this.lock = lock;
        }
        @Override
        public void run() {
            synchronized (lock) {
                System.out.println("准备唤醒");
                // 唤醒所有线程（随机）
                lock.notifyAll();
                System.out.println("唤醒结束");
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {
        Object lock = new Object();
        Object lock2 = new Object();
        // 创建三个等待线程
        Thread t1 = new Thread(new WaitTask(lock),"t1");
        Thread t2 = new Thread(new WaitTask(lock),"t2");
        Thread t3 = new Thread(new WaitTask(lock),"t3");
       // 创建一个唤醒线程
        Thread notify = new Thread(new NotifyTask(lock2),"notify线程");
        t1.start();
        t2.start();
        t3.start();
        ;
        Thread.sleep(100);
        notify.start();
        // 当前正在执行的线程数
        Thread.sleep(2000);
        System.out.println(Thread.activeCount() - 1);
    }