用java写一个外卖订餐系统并且用队列

好的，下面是一个简单的外卖订餐系统的Java代码，使用了队列进行订单的管理：

import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;

class Order {
    private String name;
    private String address;
    private String phone;

    public Order(String name, String address, String phone) {
        this.name = name;
        this.address = address;
        this.phone = phone;
    }

    public String getName() {
        return name;
    }

    public String getAddress() {
        return address;
    }

    public String getPhone() {
        return phone;
    }

    @Override
    public String toString() {
        return "Name: " + name + ", Address: " + address + ", Phone: " + phone;
    }
}

public class FoodDeliverySystem {
    private static Queue<Order> orders = new LinkedList<>();
    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            System.out.println("1. Place an order");
            System.out.println("2. View orders");
            System.out.println("3. Exit");

            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    placeOrder();
                    break;
                case 2:
                    viewOrders();
                    break;
                case 3:
                    System.exit(0);
                    break;
                default:
                    System.out.println("Invalid choice!");
                    break;
            }
        }
    }

    private static void placeOrder() {
        scanner.nextLine(); // consume the newline character

        System.out.print("Enter your name: ");
        String name = scanner.nextLine();

        System.out.print("Enter your address: ");
        String address = scanner.nextLine();

        System.out.print("Enter your phone number: ");
        String phone = scanner.nextLine();

        Order order = new Order(name, address, phone);
        orders.add(order);

        System.out.println("Order placed successfully!");
    }

    private static void viewOrders() {
        if (orders.isEmpty()) {
            System.out.println("No orders yet!");
            return;
        }

        System.out.println("Orders:");

        for (Order order : orders) {
            System.out.println(order);
        }
    }
}

在这个代码中，我们定义了一个`Order`类来表示订单，其中包含了客户的姓名、地址和电话号码等信息。我们使用了`LinkedList`作为队列的实现，通过调用`add()`方法来向队列中添加订单，使用`isEmpty()`方法来判断队列是否为空，使用`forEach()`方法来遍历队列中的订单。在`placeOrder()`方法中，我们通过`Scanner`类来获取用户输入的订单信息。在`main()`方法中，我们使用了一个无限循环来实现菜单的循环显示，当用户选择退出时，我们调用了`System.exit()`方法来终止程序的运行。