用java编写一个购物车管理系统

好的，下面是一个简单的购物车管理系统的Java代码示例：

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

public class ShoppingCart {
    private ArrayList<Item> cart;
    private double totalPrice;

    public ShoppingCart() {
        cart = new ArrayList<Item>();
        totalPrice = 0.0;
    }

    public void addItem(Item item) {
        cart.add(item);
        totalPrice += item.getPrice();
    }

    public void removeItem(int index) {
        totalPrice -= cart.get(index).getPrice();
        cart.remove(index);
    }

    public double getTotalPrice() {
        return totalPrice;
    }

    public void displayCart() {
        System.out.println("Shopping Cart Items:");
        if (cart.size() == 0) {
            System.out.println("Your cart is empty.");
        } else {
            for (int i = 0; i < cart.size(); i++) {
                System.out.println((i+1) + ". " + cart.get(i).getName());
            }
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ShoppingCart cart = new ShoppingCart();

        int choice = 0;
        do {
            System.out.println("\nMenu:");
            System.out.println("1. Add item to cart");
            System.out.println("2. Remove item from cart");
            System.out.println("3. Display cart contents");
            System.out.println("4. Display total price");
            System.out.println("5. Exit");
            System.out.print("Enter your choice: ");
            choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    System.out.print("Enter item name: ");
                    String name = scanner.next();
                    System.out.print("Enter item price: ");
                    double price = scanner.nextDouble();
                    Item item = new Item(name, price);
                    cart.addItem(item);
                    System.out.println("Item added to cart.");
                    break;
                case 2:
                    cart.displayCart();
                    System.out.print("Enter item number to remove: ");
                    int index = scanner.nextInt() - 1;
                    cart.removeItem(index);
                    System.out.println("Item removed from cart.");
                    break;
                case 3:
                    cart.displayCart();
                    break;
                case 4:
                    System.out.println("Total price: $" + cart.getTotalPrice());
                    break;
                case 5:
                    System.out.println("Exiting program.");
                    break;
                default:
                    System.out.println("Invalid choice. Please try again.");
                    break;
            }
        } while (choice != 5);
    }
}

class Item {
    private String name;
    private double price;

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

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }
}

这是一个基本的购物车管理系统，可以添加商品、删除商品、查看购物车内容和计算总价。可以根据实际需求进行修改和扩展。