用JAVA简单写一个餐饮管理系统，附上代码

下面是一个简单的使用Java编写的餐饮管理系统的示例代码：

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 int tableNumber;
    private List<MenuItem> items;

    public Order(int tableNumber) {
        this.tableNumber = tableNumber;
        this.items = new ArrayList<>();
    }

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

    public void removeItem(MenuItem item) {
        items.remove(item);
    }

    public double getTotalAmount() {
        double total = 0.0;
        for (MenuItem item : items) {
            total += item.getPrice();
        }
        return total;
    }

    public void display() {
        System.out.println("Table Number: " + tableNumber);
        System.out.println("Items:");
        for (MenuItem item : items) {
            System.out.println("- " + item.getName() + ": $" + item.getPrice());
        }
        System.out.println("Total Amount: $" + getTotalAmount());
    }
}

class Restaurant {
    private List<MenuItem> menu;
    private List<Order> orders;

    public Restaurant() {
        this.menu = new ArrayList<>();
        this.orders = new ArrayList<>();
    }

    public void addMenuItem(MenuItem item) {
        menu.add(item);
    }

    public void displayMenu() {
        System.out.println("Menu:");
        for (MenuItem item : menu) {
            System.out.println("- " + item.getName() + ": $" + item.getPrice());
        }
    }

    public void placeOrder(Order order) {
        orders.add(order);
    }

    public void displayOrders() {
        System.out.println("Orders:");
        for (Order order : orders) {
            order.display();
            System.out.println("-------------------");
        }
    }
}

public class RestaurantManagementSystem {
    public static void main(String[] args) {
        Restaurant restaurant = new Restaurant();

        // 添加菜单项
        restaurant.addMenuItem(new MenuItem("Burger", 10.99));
        restaurant.addMenuItem(new MenuItem("Fries", 4.99));
        restaurant.addMenuItem(new MenuItem("Coke", 2.99));

        // 显示菜单
        restaurant.displayMenu();

        Scanner scanner = new Scanner(System.in);

        // 下订单
        Order order1 = new Order(1);
        System.out.println("Select items for Order 1 (enter item numbers, -1 to finish):");
        while (true) {
            int itemNumber = scanner.nextInt();
            if (itemNumber == -1) {
                break;
            }
            MenuItem selectedItem = restaurant.getMenu().get(itemNumber-1);
            order1.addItem(selectedItem);
        }
        restaurant.placeOrder(order1);

        Order order2 = new Order(2);
        System.out.println("Select items for Order 2 (enter item numbers, -1 to finish):");
        while (true) {
            int itemNumber = scanner.nextInt();
            if (itemNumber == -1) {
                break;
            }
            MenuItem selectedItem = restaurant.getMenu().get(itemNumber-1);
            order2.addItem(selectedItem);
        }
        restaurant.placeOrder(order2);

        // 显示订单
        restaurant.displayOrders();
    }
}

这个示例代码实现了一个简单的餐饮管理系统，包括菜单管理、下订单和显示订单等功能。你可以根据需要进行进一步的修改和扩展。运行这段代码，你可以根据菜单项的编号选择菜单，创建订单并显示订单信息。