How to implement the Java switch grocery shopping system with shopping cart quantity reminder function

How to realize the Java switch grocery shopping system with the shopping cart quantity reminder function

With the rapid development of the Internet, e-commerce is becoming more and more popular. More and more people are beginning to shop through mobile phones or computer web pages, enjoying a convenient and efficient shopping experience. In the shopping process, the shopping cart is an indispensable tool. It facilitates users to put their favorite products into a temporary "shopping basket" and then proceed to settlement when the order is confirmed.

However, during the online shopping process, sometimes users forget that there are already several products in the shopping cart. Therefore, when designing a shopping cart, it is often necessary to add a shopping cart quantity reminder function so that users can understand the number of items in their shopping cart and avoid repeated purchases.

This article will introduce how to use Java to switch the grocery shopping system to realize the shopping cart quantity reminder function.

First, we need to define a shopping cart class, which is used to store product information in the user's shopping cart. The shopping cart class should include attributes such as product name, price and quantity. At the same time, we also need to define a method in the shopping cart class to display the number of items in the shopping cart.

public class ShoppingCart {
    private String itemName;
    private double price;
    private int quantity;
    
    // 构造函数
    public ShoppingCart(String itemName, double price, int quantity) {
        this.itemName = itemName;
        this.price = price;
        this.quantity = quantity;
    }
    
    // 获取购物车中的商品数量
    public int getQuantity() {
        return quantity;
    }
    
    // 显示购物车中的商品信息
    public void displayItemInfo() {
        System.out.println("商品名称：" + itemName);
        System.out.println("商品价格：" + price);
        System.out.println("商品数量：" + quantity);
    }
}

Next, we need to design a main program class to simulate the process of users adding products to the shopping cart. In the main program class, we can use an ArrayList to store the user's shopping cart information.

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

public class Main {
    public static void main(String[] args) {
        ArrayList<ShoppingCart> shoppingCartList = new ArrayList<>();
        Scanner scanner = new Scanner(System.in);
        
        System.out.println("欢迎使用购物车系统！");
        
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加商品到购物车");
            System.out.println("2. 查看购物车中的商品数量");
            System.out.println("3. 退出系统");
            
            int choice = scanner.nextInt();
            
            if (choice == 1) {
                System.out.println("请输入商品名称：");
                String itemName = scanner.next();
                
                System.out.println("请输入商品价格：");
                double price = scanner.nextDouble();
                
                System.out.println("请输入商品数量：");
                int quantity = scanner.nextInt();
                
                ShoppingCart shoppingCart = new ShoppingCart(itemName, price, quantity);
                shoppingCartList.add(shoppingCart);
                
                System.out.println("已成功添加商品到购物车！");
            } else if (choice == 2) {
                int totalQuantity = 0;
                for (ShoppingCart cart : shoppingCartList) {
                    totalQuantity += cart.getQuantity();
                }
                
                System.out.println("购物车中的商品数量为：" + totalQuantity);
            } else if (choice == 3) {
                System.out.println("感谢使用购物车系统，再见！");
                break;
            } else {
                System.out.println("输入无效，请重新选择操作！");
            }
        }
        
        scanner.close();
    }
}

Through the above program, users can add items to the shopping cart, view the number of items in the shopping cart, or exit the shopping cart system by selecting different operations.

In this way, we have implemented a Java switch grocery shopping system with a shopping cart quantity reminder function. During the shopping process, users can easily understand the number of items in their shopping cart and avoid repeated purchases. At the same time, this function also facilitates merchants to understand users' shopping habits and product sales, and provide better services and promotion strategies.

In general, the shopping cart quantity reminder function is a very important function in modern e-commerce, which can improve user shopping efficiency and experience. Through the implementation of the Java switch grocery shopping system, we can better meet the needs of users and provide better shopping services.

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