Thread并发问题、实现三个窗口同时售票、

package com.zhiqiang.server.basic.thread;

/**
 * @Description: 功能：用三个线程模拟三个售票口，总共200张票
 * @Author: zzq
 * @CreateDate:
 */
public class ThreadTestDemo {
    public static void main(String[] args) {
        TicketSales sales = new TicketSales();
        new Thread(sales).start();
        new Thread(sales).start();
        new Thread(sales).start();
    }
}

class TicketSales implements Runnable {
    Ticket ticket = new Ticket(20);

    @Override
    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：
        while (ticket.getTickets() > 0) {
            synchronized (ticket) {
                System.out.println(Thread.currentThread().getName() + "   卖出一张，还剩: " + (ticket.getTickets() - 1));
                try {
                    ticket.setTickets(ticket.getTickets() - 1);
                    Thread.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

class Ticket {
    //总票数
    private int tickets;

    public Ticket() {
    }

    public Ticket(int num) {
        this.tickets = num;
    }

    public int getTickets() {
        return tickets;
    }

    public void setTickets(int tickets) {
        this.tickets = tickets;
    }
}

  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：