多线程通信的三大法器，你真的会用吗？

/**
 * 微信公众号：Java技术栈
 */
public static void main(String[] args) {
    Object lock = new Object();
    Thread t1 = new Thread(() -> {
        synchronized (lock) {
            for (int i = 0; i < 20; i++) {
                System.out.print(i);
                if (i == 10) {
                    try {
                        lock.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    });

    Thread t2 = new Thread(() -> {
        synchronized (lock) {
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.print("Java技术栈");
            lock.notifyAll();
        }
    });

    t1.start();
    t2.start();
}