Java多线程之synchronized线程锁

package org.study2.javabase.ThreadsDemo.sync;

/**
 * @Auther:GongXingRui
 * @Date:2018/9/18
 * @Description:synchronized线程锁
 **/
public class TicketApp {
    public static void main(String args[]) {
        Ticket ticket = new Ticket();
        Thread t1 = new Thread(ticket, "小红");
        Thread t2 = new Thread(ticket, "明明");
        t1.start();
        t2.start();
    }
}

class Ticket implements Runnable {
    int num = 20;
    private boolean flag = true;

    @Override
    public void run() {
        while (flag) {
            test();
        }
    }

    public synchronized void test() {
        if (num <= 0) {
            flag = false;
            return;
        }
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(Thread.currentThread().getName() + "抢到票：" + num--);
    }
}