用java写出一个简单的餐饮管理系统

好的，这是一个简单的餐饮管理系统的Java代码示例：

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

public class RestaurantManagementSystem {
    public static void main(String[] args) {
        ArrayList<Food> menu = new ArrayList<>(); // 菜单列表
        ArrayList<Order> orders = new ArrayList<>(); // 订单列表
        Scanner scanner = new Scanner(System.in);

        // 初始化菜单
        menu.add(new Food("糖醋排骨", 28));
        menu.add(new Food("红烧鱼块", 38));
        menu.add(new Food("回锅肉", 32));
        menu.add(new Food("麻婆豆腐", 18));

        while (true) {
            // 打印菜单
            System.out.println("菜单：");
            for (int i = 0; i < menu.size(); i++) {
                System.out.println((i + 1) + ". " + menu.get(i).getName() + " " + menu.get(i).getPrice() + "元");
            }
            System.out.println("请选择要点的菜品序号，输入0结算：");
            int choice = scanner.nextInt();
            if (choice == 0) {
                // 结算
                System.out.println("已点菜品：");
                int total = 0;
                for (Order order : orders) {
                    System.out.println(order.getFood().getName() + " " + order.getFood().getPrice() + "元 x " + order.getCount() + "份");
                    total += order.getFood().getPrice() * order.getCount();
                }
                System.out.println("总计：" + total + "元");
                break;
            } else if (choice > 0 && choice <= menu.size()) {
                // 点菜
                System.out.println("请输入数量：");
                int count = scanner.nextInt();
                orders.add(new Order(menu.get(choice - 1), count));
                System.out.println("已点：" + menu.get(choice - 1).getName() + " " + count + "份");
            } else {
                System.out.println("无效的菜品序号！");
            }
        }
    }
}

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;
    }
}

class Order {
    private Food food;
    private int count;

    public Order(Food food, int count) {
        this.food = food;
        this.count = count;
    }

    public Food getFood() {
        return food;
    }

    public int getCount() {
        return count;
    }
}

这个程序实现了一个简单的餐饮管理系统，用户可以从菜单中选择菜品和数量，然后结算订单。菜单和订单都使用了Java中的ArrayList来存储。