java网上售票代码

以下是一个简单的Java网上售票代码示例：

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class OnlineTicketBooking {
    private static Map<String, Integer> ticketAvailability = new HashMap<>();

    public static void main(String[] args) {
        ticketAvailability.put("A", 50);
        ticketAvailability.put("B", 100);
        ticketAvailability.put("C", 75);

        Scanner scanner = new Scanner(System.in);
        System.out.println("欢迎使用网上订票系统!");

        while (true) {
            System.out.println("请选择操作:");
            System.out.println("1. 查看余票");
            System.out.println("2. 购买车票");
            System.out.println("3. 退出");

            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    viewTicketAvailability();
                    break;
                case 2:
                    buyTicket(scanner);
                    break;
                case 3:
                    System.out.println("感谢使用网上订票系统，再见!");
                    return;
                default:
                    System.out.println("无效的选择，请重新输入!");
            }
            System.out.println();
        }
    }

    private static void viewTicketAvailability() {
        System.out.println("目前的票务情况:");
        for (String ticketType : ticketAvailability.keySet()) {
            System.out.println(ticketType + ": " + ticketAvailability.get(ticketType) + "张");
        }
        System.out.println();
    }

    private static void buyTicket(Scanner scanner) {
        viewTicketAvailability();
        System.out.println("请输入要购买的车票类型和数量 (例如: A 2):");
        String ticketType = scanner.next();
        int quantity = scanner.nextInt();

        if (!ticketAvailability.containsKey(ticketType)) {
            System.out.println("无效的车票类型，请重新输入!");
            return;
        }

        int availableTickets = ticketAvailability.get(ticketType);
        if (quantity > availableTickets) {
            System.out.println("剩余车票数量不足，购买失败!");
            return;
        }

        ticketAvailability.put(ticketType, availableTickets - quantity);
        System.out.println("成功购买 " + quantity + " 张 " + ticketType + " 车票!");
    }
}

这个简单的网上订票系统使用了HashMap来跟踪不同类型车票的余票数量。用户可以选择查看余票数量、购买车票或退出系统。购买车票时，用户需要输入车票类型和数量，系统会根据输入的信息和剩余票数判断是否能够成功购买。