Java实现商品管理系统代码

### 回答1：
以下是一个简单的Java商品管理系统代码示例：

import java.util.Scanner;

public class ProductManagementSystem {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int choice;
        boolean quit = false;
        Product[] products = new Product[10];
        int productCount = 0;

        while (!quit) {
            System.out.println("1. Add a new product");
            System.out.println("2. List all products");
            System.out.println("3. Search for a product");
            System.out.println("4. Remove a product");
            System.out.println("0. Quit");
            System.out.print("Enter your choice: ");

            choice = scanner.nextInt();

            switch (choice) {
                case 0:
                    quit = true;
                    break;
                case 1:
                    if (productCount < products.length) {
                        System.out.print("Enter the product name: ");
                        String name = scanner.next();
                        System.out.print("Enter the product price: ");
                        double price = scanner.nextDouble();
                        Product product = new Product(name, price);
                        products[productCount] = product;
                        productCount++;
                    } else {
                        System.out.println("Product list is full.");
                    }
                    break;
                case 2:
                    if (productCount == 0) {
                        System.out.println("No products found.");
                    } else {
                        for (int i = 0; i < productCount; i++) {
                            System.out.println(products[i]);
                        }
                    }
                    break;
                case 3:
                    if (productCount == 0) {
                        System.out.println("No products found.");
                    } else {
                        System.out.print("Enter the product name: ");
                        String name = scanner.next();
                        boolean found = false;
                        for (int i = 0; i < productCount; i++) {
                            if (products[i].getName().equals(name)) {
                                System.out.println(products[i]);
                                found = true;
                                break;
                            }
                        }
                        if (!found) {
                            System.out.println("Product not found.");
                        }
                    }
                    break;
                case 4:
                    if (productCount == 0) {
                        System.out.println("No products found.");
                    } else {
                        System.out.print("Enter the product name: ");
                        String name = scanner.next();
                        boolean found = false;
                        for (int i = 0; i < productCount; i++) {
                            if (products[i].getName().equals(name)) {
                                for (int j = i; j < productCount - 1; j++) {
                                    products[j] = products[j + 1];
                                }
                                productCount--;
                                found = true;
                                break;
                            }
                        }
                        if (!found) {
                            System.out.println("Product not found.");
                        }
                    }
                    break;
                default:
                    System.out.println("Invalid choice.");
                    break;
            }
            System.out.println();
        }
    }
}

class Product {
    private String name;
    private double price;

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

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }

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

该代码实现了简单的商品管理系统，可以添加商品、列出所有商品、搜索商品以及删除商品。通过Scanner类获取用户输入，使用数组存储商品信息。Product类表示商品，有名称和价格两个属性，并实现了toString方法以便于输出。

### 回答2：
Java实现商品管理系统代码需要以下几个关键步骤：

1. 设计商品类：
class Product {
private String productId;
private String name;
private double price;
// 其他属性和方法省略
}

2. 创建商品管理系统类：
import java.util.ArrayList;
import java.util.List;

public class ProductManagementSystem {
private List<Product> productList;

public ProductManagementSystem() {
productList = new ArrayList<>();
}

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

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

public Product getProductById(String productId) {
for (Product product : productList) {
if (product.getProductId().equals(productId)) {
return product;
}
}
return null;
}

// 其他操作方法省略
}

3. 创建测试类：
public class Test {
public static void main(String[] args) {
ProductManagementSystem system = new ProductManagementSystem();

// 添加商品
Product product1 = new Product("1", "商品1", 10.0);
system.addProduct(product1);

// 删除商品
system.removeProduct(product1);

// 获取商品
Product product2 = system.getProductById("2");
if (product2 != null) {
System.out.println(product2.getName());
} else {
System.out.println("商品不存在");
}

// 其他操作方法测试省略
}
}

以上就是使用Java实现商品管理系统的代码。商品类用于封装商品的属性和方法，商品管理系统类用于对商品进行增删改查等操作，并通过测试类进行验证。

### 回答3：
商品管理系统是一个用于管理商品信息的系统，可以进行商品的添加、删除、修改和查询等功能。下面是一个简单的Java实现商品管理系统的代码：

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

class Product {
    private String name;
    private double price;

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

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }
}

class ProductManager {
    private List<Product> productList;

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

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

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

    public void updateProduct(Product oldProduct, Product newProduct) {
        int index = productList.indexOf(oldProduct);
        productList.set(index, newProduct);
    }

    public List<Product> searchProduct(String keyword) {
        List<Product> result = new ArrayList<>();
        for (Product product : productList) {
            if (product.getName().contains(keyword)) {
                result.add(product);
            }
        }
        return result;
    }

    public void displayAllProducts() {
        for (Product product : productList) {
            System.out.println(product.getName() + " - $" + product.getPrice());
        }
    }
}

public class Main {
    public static void main(String[] args) {
        ProductManager productManager = new ProductManager();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加商品");
            System.out.println("2. 删除商品");
            System.out.println("3. 修改商品");
            System.out.println("4. 查询商品");
            System.out.println("5. 显示所有商品");

            int choice = Integer.parseInt(scanner.nextLine());
            switch (choice) {
                case 1:
                    System.out.println("请输入商品名称：");
                    String name = scanner.nextLine();
                    System.out.println("请输入商品价格：");
                    double price = Double.parseDouble(scanner.nextLine());
                    productManager.addProduct(new Product(name, price));
                    break;
                case 2:
                    System.out.println("请输入要删除的商品名称：");
                    String deleteName = scanner.nextLine();
                    List<Product> deleteResult = productManager.searchProduct(deleteName);
                    if (deleteResult.size() == 0) {
                        System.out.println("找不到该商品！");
                    } else {
                        productManager.removeProduct(deleteResult.get(0));
                        System.out.println("删除成功！");
                    }
                    break;
                case 3:
                    System.out.println("请输入要修改的商品名称：");
                    String updateName = scanner.nextLine();
                    List<Product> updateResult = productManager.searchProduct(updateName);
                    if (updateResult.size() == 0) {
                        System.out.println("找不到该商品！");
                    } else {
                        System.out.println("请输入新的商品名称：");
                        String newProductName = scanner.nextLine();
                        System.out.println("请输入新的商品价格：");
                        double newProductPrice = Double.parseDouble(scanner.nextLine());
                        productManager.updateProduct(updateResult.get(0), new Product(newProductName, newProductPrice));
                        System.out.println("修改成功！");
                    }
                    break;
                case 4:
                    System.out.println("请输入要查询的商品名称：");
                    String searchName = scanner.nextLine();
                    List<Product> searchResult = productManager.searchProduct(searchName);
                    if (searchResult.size() == 0) {
                        System.out.println("找不到该商品！");
                    } else {
                        System.out.println("查询结果：");
                        for (Product product : searchResult) {
                            System.out.println(product.getName() + " - $" + product.getPrice());
                        }
                    }
                    break;
                case 5:
                    productManager.displayAllProducts();
                    break;
                default:
                    System.out.println("无效的操作！");
                    break;
            }
        }
    }
}

以上是一个简单的Java实现的商品管理系统。可以通过选择操作的方式，实现商品的添加、删除、修改和查询等功能。