java订餐管理系统源码

Java订餐管理系统是一个用Java语言编写的系统，用于管理餐厅的订餐业务。它可以实现用户注册、登录、浏览菜单、下单、支付等功能。以下是一个简单的Java订餐管理系统的源码示例：

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

class MenuItem {
    private String name;
    private double price;

    public MenuItem(String name, double price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }
}

class Order {
    private List<MenuItem> items;

    public Order() {
        items = new ArrayList<>();
    }

    public void addItem(MenuItem item) {
        items.add(item);
    }

    public double getTotalPrice() {
        double totalPrice = 0;
        for (MenuItem item : items) {
            totalPrice += item.getPrice();
        }
        return totalPrice;
    }
}

class Menu {
    private List<MenuItem> items;

    public Menu() {
        items = new ArrayList<>();
    }

    public void addItem(MenuItem item) {
        items.add(item);
    }

    public void displayMenu() {
        System.out.println("Menu:");
        for (int i = 0; i < items.size(); i++) {
            MenuItem item = items.get(i);
            System.out.println((i + 1) + ". " + item.getName() + " - $" + item.getPrice());
        }
    }

    public MenuItem getItem(int index) {
        return items.get(index);
    }
}

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 String getPassword() {
        return password;
    }
}

class UserManager {
    private List<User> users;

    public UserManager() {
        users = new ArrayList<>();
    }

    public void addUser(User user) {
        users.add(user);
    }

    public User getUser(String username) {
        for (User user : users) {
            if (user.getUsername().equals(username)) {
                return user;
            }
        }
        return null;
    }
}

public class OrderManagementSystem {
    private static Menu menu;
    private static UserManager userManager;

    public static void main(String[] args) {
        menu = new Menu();
        userManager = new UserManager();

        // 添加菜单项
        menu.addItem(new MenuItem("Hamburger", 5.99));
        menu.addItem(new MenuItem("Pizza", 8.99));
        menu.addItem(new MenuItem("Salad", 4.99));

        // 添加用户
        userManager.addUser(new User("admin", "admin123"));

        // 用户登录
        Scanner scanner = new Scanner(System.in);
        System.out.print("Username: ");
        String username = scanner.nextLine();
        System.out.print("Password: ");
        String password = scanner.nextLine();

        User user = userManager.getUser(username);
        if (user != null && user.getPassword().equals(password)) {
            System.out.println("Login successful!");

            // 显示菜单
            menu.displayMenu();

            // 下单
            Order order = new Order();
            while (true) {
                System.out.print("Enter item number (0 to finish): ");
                int itemNumber = scanner.nextInt();
                if (itemNumber == 0) {
                    break;
                }
                MenuItem item = menu.getItem(itemNumber - 1);
                order.addItem(item);
            }

            // 显示订单总价
            System.out.println("Total price: $" + order.getTotalPrice());
        } else {
            System.out.println("Invalid username or password!");
        }
    }
}

这个示例代码实现了一个简单的Java订餐管理系统，包括菜单管理、用户管理、登录验证、下单和计算订单总价等功能。你可以根据自己的需求进行修改和扩展。