本窗口售票系统实现了三个售票窗口的随机售票，实现随机到某一个窗口买票，总票余量都会减少，即三个窗口共享同一个票余量。若票余量小于一次性购票量，则提示报错；若车票售罄，则代码结束运行。

代码实现：

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.Random;

public class Main {
    //首先设置总票量
    public static int totalTickets = 100;
    public static void main(String[] args) {
        List<TicketOffice> list = new ArrayList<>();
        TicketOffice t1 = new TicketOffice("SC01", "1号负责人", "1号位");
        TicketOffice t2 = new TicketOffice("SC02", "2号负责人", "2号位");
        TicketOffice t3 = new TicketOffice("SC03", "3号负责人", "3号位");

        list.add(t1);
        list.add(t2);
        list.add(t3);

        Scanner sc = new Scanner(System.in);

        while (totalTickets > 0) {
            System.out.println("请输入你要购票的数量:");
            int num = sc.nextInt();

            // 检查输入的车票数量是否有效
            if (num <= 0) {
                System.out.println("请输入有效的车票数量！");
                continue;
            }

            // 随机选择一个售票窗口
            Random random = new Random();
            int randomIndex = random.nextInt(list.size());
            TicketOffice selectedOffice = list.get(randomIndex);

            try {
                selectedOffice.saleTicket(num);
                //totalTickets -= num; // 更新剩余车票总数
                System.out.println("成功从 "+selectedOffice.getOfficeId()+" 窗口售出 "+num+" 张车票。剩余车票："+totalTickets);
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
        }

        System.out.println("所有车票已售罄！");
        sc.close();
    }
}



class TicketOffice {
    private String officeId;
    private String administor;
    private String address;

    public TicketOffice() {}

    public TicketOffice(String officeId, String administor, String address) {
        this.officeId = officeId;
        this.administor = administor;
        this.address = address;
    }

    public void saleTicket(int ticketNum) throws Exception {
        if (Main.totalTickets >= ticketNum) {
            Main.totalTickets -= ticketNum;
            System.out.println("售出 " + ticketNum + " 张车票。");
        } else {
            throw new Exception("票余量不足！");
        }
    }

    public String getOfficeId() {
        return officeId;
    }
}

部分运行结果：