用eclipse写一个食堂点餐程序

好的，下面是一个简单的食堂点餐程序的实现示例，使用 Eclipse 编写：

1. 创建一个 Java 项目，并添加以下类：

/**
 * 食堂点餐程序
 */
public class MealOrderingSystem {
    public static void main(String[] args) {
        // 初始化食品菜单
        Menu menu = new Menu();
        menu.addFood(new Food("炒饭", 10));
        menu.addFood(new Food("炒面", 12));
        menu.addFood(new Food("麻婆豆腐", 15));
        menu.addFood(new Food("红烧肉", 18));
        
        // 初始化顾客订单
        Order order = new Order();
        
        // 展示菜单
        menu.showMenu();
        
        // 点餐
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.print("请选择菜品编号（输入 0 结束点餐）：");
            int foodIndex = scanner.nextInt();
            if (foodIndex == 0) {
                break;
            }
            Food food = menu.getFood(foodIndex - 1);
            if (food != null) {
                order.addFood(food);
                System.out.println("已点：" + food.getName());
            } else {
                System.out.println("菜品编号有误，请重新选择！");
            }
        }
        
        // 展示订单
        order.showOrder();
    }
}

/**
 * 菜单类
 */
class Menu {
    private List<Food> foods = new ArrayList<>();
    
    /**
     * 添加菜品
     */
    public void addFood(Food food) {
        foods.add(food);
    }
    
    /**
     * 获取菜品
     */
    public Food getFood(int index) {
        if (index >= 0 && index < foods.size()) {
            return foods.get(index);
        }
        return null;
    }
    
    /**
     * 展示菜单
     */
    public void showMenu() {
        System.out.println("欢迎来到食堂，请选择以下菜品：");
        for (int i = 0; i < foods.size(); i++) {
            System.out.println((i + 1) + ". " + foods.get(i).getName() + "（" + foods.get(i).getPrice() + "元）");
        }
    }
}

/**
 * 菜品类
 */
class Food {
    private String name;
    private int price;
    
    public Food(String name, int price) {
        this.name = name;
        this.price = price;
    }
    
    public String getName() {
        return name;
    }
    
    public int getPrice() {
        return price;
    }
}

/**
 * 订单类
 */
class Order {
    private List<Food> foods = new ArrayList<>();
    
    /**
     * 添加菜品
     */
    public void addFood(Food food) {
        foods.add(food);
    }
    
    /**
     * 展示订单
     */
    public void showOrder() {
        System.out.println("您的订单如下：");
        int totalPrice = 0;
        for (int i = 0; i < foods.size(); i++) {
            System.out.println((i + 1) + ". " + foods.get(i).getName() + "（" + foods.get(i).getPrice() + "元）");
            totalPrice += foods.get(i).getPrice();
        }
        System.out.println("总价：" + totalPrice + "元");
    }
}

2. 运行程序，在控制台中选择菜品编号添加到订单中，输入 0 结束点餐，最后展示订单信息。