写一个java的购物管理模块其中包括显示所有商品信息，查询商品详细信息，添加购物车，清空购物车，购物车结算

以下是一个简单的 Java 购物管理模块的代码示例：

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

// 商品类
class Product {
    private String name;
    private double price;
    private String description;

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

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }

    public String getDescription() {
        return description;
    }

    public String toString() {
        return name + " - " + price + " - " + description;
    }
}

// 购物车类
class ShoppingCart {
    private ArrayList<Product> products;

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

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

    public void clear() {
        products.clear();
    }

    public double getTotalPrice() {
        double totalPrice = 0.0;
        for (Product product : products) {
            totalPrice += product.getPrice();
        }
        return totalPrice;
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("Shopping Cart:\n");
        for (Product product : products) {
            sb.append(product.toString()).append("\n");
        }
        sb.append("Total price: ").append(getTotalPrice());
        return sb.toString();
    }
}

// 商品管理类
class ProductManager {
    private ArrayList<Product> products;

    public ProductManager() {
        products = new ArrayList<Product>();
    }

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

    public void showProducts() {
        System.out.println("Product list:");
        for (Product product : products) {
            System.out.println(product.toString());
        }
    }

    public void showProductDetails(String name) {
        for (Product product : products) {
            if (product.getName().equals(name)) {
                System.out.println(product.toString());
                return;
            }
        }
        System.out.println("Product not found.");
    }
}

// 主程序
public class Main {
    public static void main(String[] args) {
        ProductManager productManager = new ProductManager();
        productManager.addProduct(new Product("iPhone", 999.99, "Apple iPhone"));
        productManager.addProduct(new Product("Samsung Galaxy", 899.99, "Samsung Galaxy"));
        productManager.addProduct(new Product("Google Pixel", 799.99, "Google Pixel"));

        ShoppingCart shoppingCart = new ShoppingCart();

        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("1. Show all products");
            System.out.println("2. Show product details");
            System.out.println("3. Add to cart");
            System.out.println("4. Clear cart");
            System.out.println("5. Checkout");
            System.out.println("0. Exit");
            System.out.print("Enter your choice: ");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    productManager.showProducts();
                    break;
                case 2:
                    System.out.print("Enter product name: ");
                    String name = scanner.next();
                    productManager.showProductDetails(name);
                    break;
                case 3:
                    System.out.print("Enter product name: ");
                    name = scanner.next();
                    for (Product product : productManager.getProducts()) {
                        if (product.getName().equals(name)) {
                            shoppingCart.addProduct(product);
                            System.out.println("Added to cart.");
                            break;
                        }
                    }
                    break;
                case 4:
                    shoppingCart.clear();
                    System.out.println("Cart cleared.");
                    break;
                case 5:
                    System.out.println(shoppingCart.toString());
                    System.out.println("Thank you for shopping!");
                    System.exit(0);
                    break;
                case 0:
                    System.exit(0);
                    break;
                default:
                    System.out.println("Invalid choice.");
                    break;
            }
        }
    }
}

该示例代码包括了商品类、购物车类和商品管理类三个类，并在主程序中进行了调用。用户可以通过主程序进行以下操作：

1. 显示所有商品信息
2. 查询商品详细信息
3. 添加购物车
4. 清空购物车
5. 购物车结算

用户输入对应的数字即可进行操作。示例代码中提供了三种商品，可以根据需要添加更多商品。