手撕三个线程并发按照顺序打印数字

三个线程并发按照顺序打印数字，直觉是创建一个runnable任务，然后建三个线程去执行。通过加锁去实现打印的循序

public class Main {
    //三个线程并发打印数字
    public static void main(String[] args) {
        Count count = new Count();
        Thread thread1 = new Thread(count, "1");
        Thread thread2 = new Thread(count, "2");
        Thread thread3 = new Thread(count, "3");
        thread1.start();
        thread2.start();
        thread3.start();
    }

}

class Count implements Runnable {
    int i = 1;
    Object lock = new Object();

    public void run() {
        synchronized (lock) {
            while (i < 100)
                if (i % 3 + 1 == Integer.parseInt(Thread.currentThread().getName())) {
                    System.out.println(i++);
                    lock.notifyAll();//唤醒其他线程
                } else {
                    try {
                        lock.wait();//该线程阻塞
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
        }
    }
}

截取0-10的输出

线程1 0
线程2 1
线程3 2
线程1 3
线程2 4
线程3 5
线程1 6
线程2 7
线程3 8
线程1 9