Idea线程轮流打印数字，一直到100

package com.zgm.zuoye;
/*
* 两个线程轮流打印数字，一直到100
*
* */
public class Thread1 extends Thread {

    static int num = 0;
    static Object obj = new Object();

    @Override
    public void run() {
        shu();
    }

    private static synchronized void shu() {

        while (true) {
            try {
                Thread.sleep(100);
                if (num <= 100) {

                    System.out.println("数字：" + num);
                    num++;

                } else {
                    System.exit(0);
                }

            } catch (InterruptedException e) {
                e.printStackTrace();
            }


        }


    }

    public static void main(String[] args) {
        Thread1 td1 = new Thread1();
        td1.start();//开启线程
        Thread1 td2 = new Thread1();
        td2.start();//开启线程


    }


}