java写一个实现对用户的增删查改 对商品的增删查改的购物系统

好的，这是一个比较常见的购物系统，我们可以使用Java语言来实现，以下是一个简单的代码示例：

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

class User {
    String name;
    String address;
    String phoneNumber;

    public User(String name, String address, String phoneNumber) {
        this.name = name;
        this.address = address;
        this.phoneNumber = phoneNumber;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }
}

class Product {
    String name;
    String description;
    double price;

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

class ShoppingSystem {
    List<User> users = new ArrayList<>();
    List<Product> products = new ArrayList<>();

    public void addUser(User user) {
        users.add(user);
    }

    public void removeUser(User user) {
        users.remove(user);
    }

    public User findUserByName(String name) {
        for (User user : users) {
            if (user.getName().equals(name)) {
                return user;
            }
        }
        return null;
    }

    public void addProduct(Product product) {
        products.add(product);
    }

    public void removeProduct(Product product) {
        products.remove(product);
    }

    public Product findProductByName(String name) {
        for (Product product : products) {
            if (product.getName().equals(name)) {
                return product;
            }
        }
        return null;
    }
}

public class Main {
    public static void main(String[] args) {
        ShoppingSystem shoppingSystem = new ShoppingSystem();

        User user1 = new User("张三", "上海市浦东新区", "13800000001");
        User user2 = new User("李四", "上海市闵行区", "13800000002");

        shoppingSystem.addUser(user1);
        shoppingSystem.addUser(user2);

        System.out.println(shoppingSystem.findUserByName("张三").getPhoneNumber());

        Product product1 = new Product("手机", "苹果手机", 5000);
        Product product2 = new Product("电脑", "戴尔电脑", 8000);

        shoppingSystem.addProduct(product1);
        shoppingSystem.addProduct(product2);

        System.out.println(shoppingSystem.findProductByName("电脑").getPrice());
    }
}

以上是一个简单的购物系统的Java实现，其中包含了对用户和商品的增删查改操作。当然这里只是一个简单的示例，实际系统中还需要考虑很多其他功能和细节。