Thread并发问题、实现三个窗口同时售票、 

 1 package com.zhiqiang.server.basic.thread;
 2 
 3 /**
 4  * @Description: 功能：用三个线程模拟三个售票口，总共200张票
 5  * @Author: zzq
 6  * @CreateDate:
 7  */
 8 public class ThreadTestDemo {
 9     public static void main(String[] args) {
10         TicketSales sales = new TicketSales();
11         new Thread(sales).start();
12         new Thread(sales).start();
13         new Thread(sales).start();
14     }
15 }
16 
17 class TicketSales implements Runnable {
18     Ticket ticket = new Ticket(20);
19 
20     @Override
21     public void run() {
　　　　　　//当这里剩下一张票的时候，三个线程可能会同时 拿到最后一张票，就会出现如下运行结果：
22         while (ticket.getTickets() > 0) {
23             synchronized (ticket) {
24                 System.out.println(Thread.currentThread().getName() + "   卖出一张，还剩: " + (ticket.getTickets() - 1));
25                 try {
26                     ticket.setTickets(ticket.getTickets() - 1);
27                     Thread.sleep(1);
28                 } catch (InterruptedException e) {
29                     e.printStackTrace();
30                 }
31             }
32         }
33     }
34 }
35 
36 class Ticket {
37     //总票数
38     private int tickets;
39 
40     public Ticket() {
41     }
42 
43     public Ticket(int num) {
44         this.tickets = num;
45     }
46 
47     public int getTickets() {
48         return tickets;
49     }
50 
51     public void setTickets(int tickets) {
52         this.tickets = tickets;
53     }
54 }

 

  解决方案就是在买票前判断： 如果票<=0 ， 则提示票已经卖完：

 

运行结果：

 

posted @ 2020-11-06 10:41  BlakeYa  阅读(369)  评论(0)  编辑  收藏  举报