并发问题

package com.daxing.demo01;
//多个线程同时操作一个对象
//买火车票的例子

//发现问题：多个线程操作同一个资源的情况下，线程不安全，数据混乱。
public class TestThread04 implements Runnable {
    //票数
    private int ticketNum = 10;

    @Override
    public void run() {
        while (true) {
            if (ticketNum <= 0) {
                break;
            }
            //模拟延时
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + "--拿到了第" + ticketNum-- + "票");

        }
    }

    public static void main(String[] args) {
        TestThread04 ticket = new TestThread04();
        new Thread(ticket,"xiaom").start();
        new Thread(ticket,"daxing").start();
        new Thread(ticket,"big").start();

    }
    }