Java多线程wait和notify协作，按序打印abc

有一个经典的多线程面试题：启三个线程，按序打印ABC

上代码：

package cn.javaBase.study_thread1;


class MyRunnable1 implements Runnable {
    private Object prev;
    private Object self;
    private String name;
    
    public MyRunnable1(String n, Object p, Object s) {
        this.name = n;
        this.prev = p;
        this.self = s;
    }
    
    @Override
    public void run() {
        while (true) {
            synchronized (prev) {
                synchronized (self) {
                    System.out.println(name);
                    self.notify();
                }
                try {
                    prev.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

public class Thread5ABC {

    public static void main(String[] args) throws InterruptedException {
        Object a = new Object();
        Object b = new Object();
        Object c = new Object();
        
        MyRunnable1 ra = new MyRunnable1("a", c, a);
        MyRunnable1 rb = new MyRunnable1("b", a, b);
        MyRunnable1 rc = new MyRunnable1("c", b, c);

        new Thread(ra).start();;
        Thread.sleep(200);
        new Thread(rb).start();
        Thread.sleep(200);
        new Thread(rc).start();
        Thread.sleep(200);
        
    }
}

打印的结果，就是循环的打印abcabcabcabc