java添加一个管理员 添加用户 删除用户 添加菜系 查看用户 修改密码 修改菜价

以下是使用Java语言实现的简单示例代码，演示如何完成上述操作：

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

class User {
    private String username;
    private String password;

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

    // Getters and setters

    // ...
}

class Admin {
    private String username;
    private String password;

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

    // Getters and setters

    // ...
}

class Dish {
    private String name;
    private double price;

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

    // Getters and setters

    // ...
}

public class RestaurantManagementSystem {
    private List<User> users;
    private List<Admin> admins;
    private List<Dish> dishes;

    public RestaurantManagementSystem() {
        users = new ArrayList<>();
        admins = new ArrayList<>();
        dishes = new ArrayList<>();
    }

    public void addAdmin(String username, String password) {
        Admin admin = new Admin(username, password);
        admins.add(admin);
        System.out.println("管理员添加成功！");
    }

    public void addUser(String username, String password) {
        User user = new User(username, password);
        users.add(user);
        System.out.println("用户添加成功！");
    }

    public void deleteUser(String username) {
        User userToRemove = null;
        for (User user : users) {
            if (user.getUsername().equals(username)) {
                userToRemove = user;
                break;
            }
        }
        if (userToRemove != null) {
            users.remove(userToRemove);
            System.out.println("用户删除成功！");
        } else {
            System.out.println("找不到要删除的用户！");
        }
    }

    public void addDish(String name, double price) {
        Dish dish = new Dish(name, price);
        dishes.add(dish);
        System.out.println("菜品添加成功！");
    }

    public void viewUsers() {
        System.out.println("用户列表：");
        for (User user : users) {
            System.out.println(user.getUsername());
        }
    }

    public void changePassword(String username, String newPassword) {
        for (User user : users) {
            if (user.getUsername().equals(username)) {
                user.setPassword(newPassword);
                System.out.println("密码修改成功！");
                return;
            }
        }
        System.out.println("找不到要修改密码的用户！");
    }

    public void changeDishPrice(String dishName, double newPrice) {
        for (Dish dish : dishes) {
            if (dish.getName().equals(dishName)) {
                dish.setPrice(newPrice);
                System.out.println("菜品价格修改成功！");
                return;
            }
        }
        System.out.println("找不到要修改价格的菜品！");
    }

    public static void main(String[] args) {
        RestaurantManagementSystem system = new RestaurantManagementSystem();

        // 添加管理员
        system.addAdmin("admin1", "admin1password");

        // 添加用户
        system.addUser("user1", "user1password");

        // 删除用户
        system.deleteUser("user1");

        // 添加菜系
        system.addDish("Dish1", 10.99);

        // 查看用户
        system.viewUsers();

        // 修改密码
        system.changePassword("user1", "newpassword");

        // 修改菜价
        system.changeDishPrice("Dish1", 12.99);
    }
}

请注意，这只是一个简单的示例，实际的实现可能需要更多的细节和逻辑。您可以根据自己的需求进行进一步的定制和扩展。