java写二手车交易管理系统

一个二手车交易管理系统需要考虑以下几个方面：

1. 用户管理：包括用户注册、登录、个人信息管理等功能；
2. 车辆管理：包括车辆信息的添加、删除、修改、查询等功能；
3. 订单管理：包括订单的添加、删除、修改、查询等功能；
4. 支付管理：包括支付方式的选择、支付记录的查询等功能；
5. 数据统计：包括车辆销售量、交易金额等数据的统计。

以下是一个简单的二手车交易管理系统的Java代码示例：

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

public class SecondHandCarManagementSystem {
    // 用户管理
    private static List<User> users = new ArrayList<>();
    // 车辆管理
    private static List<Car> cars = new ArrayList<>();
    // 订单管理
    private static List<Order> orders = new ArrayList<>();

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 用户管理");
            System.out.println("2. 车辆管理");
            System.out.println("3. 订单管理");
            System.out.println("4. 支付管理");
            System.out.println("5. 数据统计");
            System.out.println("6. 退出程序");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    userManagement(scanner);
                    break;
                case 2:
                    carManagement(scanner);
                    break;
                case 3:
                    orderManagement(scanner);
                    break;
                case 4:
                    paymentManagement(scanner);
                    break;
                case 5:
                    dataStatistics();
                    break;
                case 6:
                    System.out.println("感谢使用本系统！");
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入有误，请重新选择。");
            }
        }
    }

    // 用户管理
    private static void userManagement(Scanner scanner) {
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 用户注册");
            System.out.println("2. 用户登录");
            System.out.println("3. 修改个人信息");
            System.out.println("4. 返回上级菜单");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    registerUser(scanner);
                    break;
                case 2:
                    loginUser(scanner);
                    break;
                case 3:
                    updateUser(scanner);
                    break;
                case 4:
                    return;
                default:
                    System.out.println("输入有误，请重新选择。");
            }
        }
    }

    // 用户注册
    private static void registerUser(Scanner scanner) {
        System.out.println("请输入用户名：");
        String username = scanner.next();
        System.out.println("请输入密码：");
        String password = scanner.next();

        User user = new User(username, password);
        users.add(user);

        System.out.println("注册成功！");
    }

    // 用户登录
    private static void loginUser(Scanner scanner) {
        System.out.println("请输入用户名：");
        String username = scanner.next();
        System.out.println("请输入密码：");
        String password = scanner.next();

        for (User user : users) {
            if (user.getUsername().equals(username) && user.getPassword().equals(password)) {
                System.out.println("登录成功！");
                return;
            }
        }

        System.out.println("用户名或密码错误，请重新登录。");
    }

    // 修改个人信息
    private static void updateUser(Scanner scanner) {
        System.out.println("请输入要修改信息的用户名：");
        String username = scanner.next();

        for (User user : users) {
            if (user.getUsername().equals(username)) {
                System.out.println("请输入新密码：");
                String password = scanner.next();
                user.setPassword(password);
                System.out.println("修改成功！");
                return;
            }
        }

        System.out.println("用户不存在，请重新输入。");
    }

    // 车辆管理
    private static void carManagement(Scanner scanner) {
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加车辆");
            System.out.println("2. 删除车辆");
            System.out.println("3. 修改车辆信息");
            System.out.println("4. 查询车辆");
            System.out.println("5. 返回上级菜单");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addCar(scanner);
                    break;
                case 2:
                    deleteCar(scanner);
                    break;
                case 3:
                    updateCar(scanner);
                    break;
                case 4:
                    queryCar(scanner);
                    break;
                case 5:
                    return;
                default:
                    System.out.println("输入有误，请重新选择。");
            }
        }
    }

    // 添加车辆
    private static void addCar(Scanner scanner) {
        System.out.println("请输入车辆品牌：");
        String brand = scanner.next();
        System.out.println("请输入车辆型号：");
        String model = scanner.next();
        System.out.println("请输入车辆颜色：");
        String color = scanner.next();
        System.out.println("请输入车辆价格：");
        double price = scanner.nextDouble();

        Car car = new Car(brand, model, color, price);
        cars.add(car);

        System.out.println("添加车辆成功！");
    }

    // 删除车辆
    private static void deleteCar(Scanner scanner) {
        System.out.println("请输入要删除的车辆品牌：");
        String brand = scanner.next();
        System.out.println("请输入要删除的车辆型号：");
        String model = scanner.next();

        for (Car car : cars) {
            if (car.getBrand().equals(brand) && car.getModel().equals(model)) {
                cars.remove(car);
                System.out.println("删除车辆成功！");
                return;
            }
        }

        System.out.println("车辆不存在，请重新输入。");
    }

    // 修改车辆信息
    private static void updateCar(Scanner scanner) {
        System.out.println("请输入要修改信息的车辆品牌：");
        String brand = scanner.next();
        System.out.println("请输入要修改信息的车辆型号：");
        String model = scanner.next();

        for (Car car : cars) {
            if (car.getBrand().equals(brand) && car.getModel().equals(model)) {
                System.out.println("请输入新的车辆品牌：");
                String newBrand = scanner.next();
                System.out.println("请输入新的车辆型号：");
                String newModel = scanner.next();
                System.out.println("请输入新的车辆颜色：");
                String newColor = scanner.next();
                System.out.println("请输入新的车辆价格：");
                double newPrice = scanner.nextDouble();

                car.setBrand(newBrand);
                car.setModel(newModel);
                car.setColor(newColor);
                car.setPrice(newPrice);

                System.out.println("修改车辆信息成功！");
                return;
            }
        }

        System.out.println("车辆不存在，请重新输入。");
    }

    // 查询车辆
    private static void queryCar(Scanner scanner) {
        System.out.println("请输入要查询的车辆品牌：");
        String brand = scanner.next();
        System.out.println("请输入要查询的车辆型号：");
        String model = scanner.next();

        for (Car car : cars) {
            if (car.getBrand().equals(brand) && car.getModel().equals(model)) {
                System.out.println(car);
                return;
            }
        }

        System.out.println("车辆不存在，请重新输入。");
    }

    // 订单管理
    private static void orderManagement(Scanner scanner) {
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 创建订单");
            System.out.println("2. 取消订单");
            System.out.println("3. 修改订单");
            System.out.println("4. 查询订单");
            System.out.println("5. 返回上级菜单");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    createOrder(scanner);
                    break;
                case 2:
                    cancelOrder(scanner);
                    break;
                case 3:
                    updateOrder(scanner);
                    break;
                case 4:
                    queryOrder(scanner);
                    break;
                case 5:
                    return;
                default:
                    System.out.println("输入有误，请重新选择。");
            }
        }
    }

    // 创建订单
    private static void createOrder(Scanner scanner) {
        System.out.println("请输入买家用户名：");
        String buyer = scanner.next();
        System.out.println("请输入卖家用户名：");
        String seller = scanner.next();
        System.out.println("请输入车辆品牌：");
        String brand = scanner.next();
        System.out.println("请输入车辆型号：");
        String model = scanner.next();

        for (Car car : cars) {
            if (car.getBrand().equals(brand) && car.getModel().equals(model)) {
                Order order = new Order(buyer, seller, car);
                orders.add(order);

                System.out.println("创建订单成功！");
                return;
            }
        }

        System.out.println("车辆不存在，请重新输入。");
    }

    // 取消订单
    private static void cancelOrder(Scanner scanner) {
        System.out.println("请输入要取消的订单号：");
        int orderNumber = scanner.nextInt();

        for (Order order : orders) {
            if (order.getOrderNumber() == orderNumber) {
                orders.remove(order);
                System.out.println("取消订单成功！");
                return;
            }
        }

        System.out.println("订单不存在，请重新输入。");
    }

    // 修改订单
    private static void updateOrder(Scanner scanner) {
        System.out.println("请输入要修改的订单号：");
        int orderNumber = scanner.nextInt();

        for (Order order : orders) {
            if (order.getOrderNumber() == orderNumber) {
                System.out.println("请输入新的买家用户名：");
                String newBuyer = scanner.next();
                System.out.println("请输入新的卖家用户名：");
                String newSeller = scanner.next();
                System.out.println("请输入新的车辆品牌：");
                String newBrand = scanner.next();
                System.out.println("请输入新的车辆型号：");
                String newModel = scanner.next();

                for (Car car : cars) {
                    if (car.getBrand().equals(newBrand) && car.getModel().equals(newModel)) {
                        order.setBuyer(newBuyer);
                        order.setSeller(newSeller);
                        order.setCar(car);

                        System.out.println("修改订单成功！");
                        return;
                    }
                }

                System.out.println("车辆不存在，请重新输入。");
                return;
            }
        }

        System.out.println("订单不存在，请重新输入。");
    }

    // 查询订单
    private static void queryOrder(Scanner scanner) {
        System.out.println("请输入要查询的订单号：");
        int orderNumber = scanner.nextInt();

        for (Order order : orders) {
            if (order.getOrderNumber() == orderNumber) {
                System.out.println(order);
                return;
            }
        }

        System.out.println("订单不存在，请重新输入。");
    }

    // 支付管理
    private static void paymentManagement(Scanner scanner) {
        System.out.println("请输入要支付的订单号：");
        int orderNumber = scanner.nextInt();

        for (Order order : orders) {
            if (order.getOrderNumber() == orderNumber) {
                System.out.println("请输入支付方式：");
                String paymentMethod = scanner.next();
                order.setPaymentMethod(paymentMethod);

                System.out.println("支付成功！");
                return;
            }
        }

        System.out.println("订单不存在，请重新输入。");
    }

    // 数据统计
    private static void dataStatistics() {
        int totalSales = 0;
        double totalRevenue = 0.0;

        for (Order order : orders) {
            totalSales++;
            totalRevenue += order.getCar().getPrice();
        }

        System.out.println("总销售量：" + totalSales);
        System.out.println("总交易额：" + totalRevenue);
    }
}

class User {
    private String username;
    private String password;

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

class Car {
    private String brand;
    private String model;
    private String color;
    private double price;

    public Car(String brand, String model, String color, double price) {
        this.brand = brand;
        this.model = model;
        this.color = color;
        this.price = price;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "品牌：" + brand + "，型号：" + model + "，颜色：" + color + "，价格：" + price;
    }
}

class Order {
    private static int count = 0;

    private int orderNumber;
    private String buyer;
    private String seller;
    private Car car;
    private String paymentMethod;

    public Order(String buyer, String seller, Car car) {
        this.orderNumber = ++count;
        this.buyer = buyer;
        this.seller = seller;
        this.car = car;
    }

    public int getOrderNumber() {
        return orderNumber;
    }

    public void setOrderNumber(int orderNumber) {
        this.orderNumber = orderNumber;
    }

    public String getBuyer() {
        return buyer;
    }

    public void setBuyer(String buyer) {
        this.buyer = buyer;
    }

    public String getSeller() {
        return seller;
    }

    public void setSeller(String seller) {
        this.seller = seller;
    }

    public Car getCar() {
        return car;
    }

    public void setCar(Car car) {
        this.car = car;
    }

    public String getPaymentMethod() {
        return paymentMethod;
    }

    public void setPaymentMethod(String paymentMethod) {
        this.paymentMethod = paymentMethod;
    }

    @Override
    public String toString() {
        return "订单号：" + orderNumber + "，买家：" + buyer + "，卖家：" + seller + "，车辆信息：" + car;
    }
}

这只是一个简单的示例，实际开发中还需要考虑更多的细节和功能。