多线程交替打印之join

package com.zhang.reflection.面试.多线程打印;
public class join实现 {
    static class printABC implements Runnable {
        private Thread beforeThread;

        public printABC(Thread beforeThread) {
            this.beforeThread = beforeThread;
        }

        @Override
        public void run() {
            if (beforeThread != null) {
                try {
                    beforeThread.join();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.print(Thread.currentThread().getName());
        }
    }

    public static void main(String[] args) throws InterruptedException {
        for (int i = 0; i < 10; i++) {
            Thread t1 = new Thread(new printABC(null), "A");
            Thread t2 = new Thread(new printABC(t1), "B");
            Thread t3 = new Thread(new printABC(t2), "C");
            t1.start();
            t2.start();
            t3.start();
            Thread.sleep(100);
        }
    }
}