用java写一个航班订票系统

以下是一个简单的基于Java的航班订票系统的示例代码，它包括以下功能：用户登录、航班查询、航班订票、订单查询、订单取消等。

需要注意的是，这只是一个简单的示例代码，实际的航班订票系统需要更多的功能和细节处理，例如航班和座位的管理、支付系统等等。

import java.util.ArrayList;
import java.util.Scanner;

public class FlightBookingSystem {
    private static ArrayList<User> users = new ArrayList<>();  // 用户列表
    private static ArrayList<Flight> flights = new ArrayList<>();  // 航班列表
    private static ArrayList<Order> orders = new ArrayList<>();  // 订单列表

    public static void main(String[] args) {
        // 初始化系统数据
        initSystemData();

        // 登录
        User user = login();

        // 展示菜单
        while (true) {
            showMenu();
            int choice = getChoice();
            switch (choice) {
                case 1:
                    // 航班查询
                    searchFlights();
                    break;
                case 2:
                    // 航班订票
                    bookFlight(user);
                    break;
                case 3:
                    // 订单查询
                    queryOrders(user);
                    break;
                case 4:
                    // 订单取消
                    cancelOrder(user);
                    break;
                case 5:
                    // 退出系统
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入错误，请重新输入！");
            }
        }
    }

    // 初始化系统数据
    private static void initSystemData() {
        // 初始化用户数据
        users.add(new User("张三", "123456"));
        users.add(new User("李四", "123456"));

        // 初始化航班数据
        flights.add(new Flight("MU1234", "上海", "北京", "2021-06-01", 200));
        flights.add(new Flight("MU2345", "上海", "广州", "2021-06-02", 150));
        flights.add(new Flight("MU3456", "北京", "上海", "2021-06-03", 180));
        flights.add(new Flight("MU4567", "广州", "上海", "2021-06-04", 120));
    }

    // 用户登录
    private static User login() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入用户名：");
        String name = scanner.nextLine();
        System.out.println("请输入密码：");
        String password = scanner.nextLine();
        for (User user : users) {
            if (user.getName().equals(name) && user.getPassword().equals(password)) {
                System.out.println("登录成功！");
                return user;
            }
        }
        System.out.println("用户名或密码错误，登录失败！");
        System.exit(0);
        return null;
    }

    // 展示菜单
    private static void showMenu() {
        System.out.println("-----------------");
        System.out.println("1. 航班查询");
        System.out.println("2. 航班订票");
        System.out.println("3. 订单查询");
        System.out.println("4. 订单取消");
        System.out.println("5. 退出系统");
        System.out.println("-----------------");
    }

    // 获取用户选择
    private static int getChoice() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入您的选择：");
        return scanner.nextInt();
    }

    // 航班查询
    private static void searchFlights() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入出发地：");
        String from = scanner.nextLine();
        System.out.println("请输入目的地：");
        String to = scanner.nextLine();
        System.out.println("请输入出发日期：");
        String date = scanner.nextLine();
        System.out.println("查询结果如下：");
        System.out.println("-----------------");
        System.out.println("航班号\t出发地\t目的地\t出发日期\t余票数");
        for (Flight flight : flights) {
            if (flight.getFrom().equals(from) && flight.getTo().equals(to) && flight.getDate().equals(date)) {
                System.out.println(flight.getNumber() + "\t" + flight.getFrom() + "\t" + flight.getTo() + "\t" + flight.getDate() + "\t" + flight.getRemainingSeats());
            }
        }
        System.out.println("-----------------");
    }

    // 航班订票
    private static void bookFlight(User user) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要订购的航班号：");
        String number = scanner.nextLine();
        System.out.println("请输入要订购的座位数：");
        int count = scanner.nextInt();
        // 查找航班
        Flight flight = null;
        for (Flight f : flights) {
            if (f.getNumber().equals(number)) {
                flight = f;
                break;
            }
        }
        if (flight == null) {
            System.out.println("无效的航班号！");
            return;
        }
        // 判断余票是否足够
        if (flight.getRemainingSeats() < count) {
            System.out.println("余票不足，订票失败！");
            return;
        }
        // 生成订单
        Order order = new Order(user, flight, count);
        orders.add(order);
        // 更新航班信息
        flight.setRemainingSeats(flight.getRemainingSeats() - count);
        System.out.println("订票成功！");
    }

    // 订单查询
    private static void queryOrders(User user) {
        System.out.println("查询结果如下：");
        System.out.println("-----------------");
        System.out.println("订单号\t用户名\t航班号\t出发地\t目的地\t出发日期\t座位数\t价格");
        for (Order order : orders) {
            if (order.getUser().equals(user)) {
                System.out.println(order.getNumber() + "\t" + order.getUser().getName() + "\t" + order.getFlight().getNumber() + "\t" + order.getFlight().getFrom() + "\t" + order.getFlight().getTo() + "\t" + order.getFlight().getDate() + "\t" + order.getCount() + "\t" + order.getPrice());
            }
        }
        System.out.println("-----------------");
    }

    // 订单取消
    private static void cancelOrder(User user) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要取消的订单号：");
        String number = scanner.nextLine();
        // 查找订单
        Order order = null;
        for (Order o : orders) {
            if (o.getNumber().equals(number)) {
                order = o;
                break;
            }
        }
        if (order == null) {
            System.out.println("无效的订单号！");
            return;
        }
        // 判断订单是否属于当前用户
        if (!order.getUser().equals(user)) {
            System.out.println("无权操作该订单！");
            return;
        }
        // 更新订单信息和航班信息
        orders.remove(order);
        order.getFlight().setRemainingSeats(order.getFlight().getRemainingSeats() + order.getCount());
        System.out.println("取消订单成功！");
    }
}

class User {
    private String name;
    private String password;

    public User(String name, String password) {
        this.name = name;
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public String getPassword() {
        return password;
    }
}

class Flight {
    private String number;
    private String from;
    private String to;
    private String date;
    private int totalSeats;
    private int remainingSeats;

    public Flight(String number, String from, String to, String date, int totalSeats) {
        this.number = number;
        this.from = from;
        this.to = to;
        this.date = date;
        this.totalSeats = totalSeats;
        this.remainingSeats = totalSeats;
    }

    public String getNumber() {
        return number;
    }

    public String getFrom() {
        return from;
    }

    public String getTo() {
        return to;
    }

    public String getDate() {
        return date;
    }

    public int getTotalSeats() {
        return totalSeats;
    }

    public int getRemainingSeats() {
        return remainingSeats;
    }

    public void setRemainingSeats(int remainingSeats) {
        this.remainingSeats = remainingSeats;
    }
}

class Order {
    private static int count = 0;
    private String number;
    private User user;
    private Flight flight;
    private int countOfSeats;
    private double price;

    public Order(User user, Flight flight, int countOfSeats) {
        this.number = "O" + (++count);  // 自动生成订单号
        this.user = user;
        this.flight = flight;
        this.countOfSeats = countOfSeats;
        this.price = countOfSeats * 100;  // 简单的计算价格规则：每张票100元
    }

    public String getNumber() {
        return number;
    }

    public User getUser() {
        return user;
    }

    public Flight getFlight() {
        return flight;
    }

    public int getCount() {
        return countOfSeats;
    }

    public double getPrice() {
        return price;
    }
}