Java로 간단한 장바구니 기능을 구현하는 방법은 무엇입니까?

public class Product {
    private String name;
    private double price;
    private int quantity;

    public Product(String name, double price, int quantity) {
        this.name = name;
        this.price = price;
        this.quantity = quantity;
    }

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }

    public int getQuantity() {
        return quantity;
    }
}

import java.util.ArrayList;
import java.util.List;

public class ShoppingCart {
    private List<Product> items;

    public ShoppingCart() {
        items = new ArrayList<>();
    }

    public void addItem(Product product) {
        items.add(product);
    }

    public void removeItem(Product product) {
        items.remove(product);
    }

    public double getTotalPrice() {
        double totalPrice = 0;

        for (Product item : items) {
            totalPrice += item.getPrice() * item.getQuantity();
        }

        return totalPrice;
    }

    public List<Product> getItems() {
        return items;
    }
}

public class Main {
    public static void main(String[] args) {
        // 创建商品
        Product apple = new Product("Apple", 2.5, 3);
        Product banana = new Product("Banana", 1.5, 5);
        Product orange = new Product("Orange", 3, 2);

        // 创建购物车
        ShoppingCart cart = new ShoppingCart();

        // 添加商品到购物车
        cart.addItem(apple);
        cart.addItem(banana);
        cart.addItem(orange);

        // 查看购物车中的商品
        List<Product> items = cart.getItems();
        System.out.println("购物车中的商品：");
        for (Product item : items) {
            System.out.println(item.getName() + " - 价格：" + item.getPrice() + " - 数量：" + item.getQuantity());
        }

        // 计算总价
        double totalPrice = cart.getTotalPrice();
        System.out.println("购物车中的总价：" + totalPrice);

        // 从购物车中删除商品
        cart.removeItem(apple);

        // 再次查看购物车中的商品
        items = cart.getItems();
        System.out.println("删除后购物车中的商品：");
        for (Product item : items) {
            System.out.println(item.getName() + " - 价格：" + item.getPrice() + " - 数量：" + item.getQuantity());
        }

        // 再次计算总价
        totalPrice = cart.getTotalPrice();
        System.out.println("删除后购物车中的总价：" + totalPrice);
    }
}