Java库存管理系统开发教程详解

public class Product {
    private int id;
    private String name;
    private double price;
    private int quantity;
<pre class="brush:java;toolbar:false;">public Product(int id, String name, double price, int quantity) {
    this.id = id;
    this.name = name;
    this.price = price;
    this.quantity = quantity;
}

// Getter 和 Setter 方法
public int getId() { return id; }
public void setId(int id) { this.id = id; }

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

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

public int getQuantity() { return quantity; }
public void setQuantity(int quantity) { this.quantity = quantity; }

@Override
public String toString() {
    return "ID: " + id + ", 名称: " + name + ", 价格: " + price + ", 库存: " + quantity;
}

}

import java.util.HashMap;
import java.util.Map;
<p>public class InventoryManager {
private Map<Integer, Product> inventory;</p><pre class="brush:java;toolbar:false;">public InventoryManager() {
    inventory = new HashMap<>();
}

// 添加商品
public void addProduct(Product product) {
    if (inventory.containsKey(product.getId())) {
        System.out.println("商品已存在，更新库存...");
        Product existing = inventory.get(product.getId());
        existing.setQuantity(existing.getQuantity() + product.getQuantity());
    } else {
        inventory.put(product.getId(), product);
        System.out.println("商品添加成功：" + product.getName());
    }
}

// 删除商品
public void removeProduct(int productId) {
    if (inventory.remove(productId) != null) {
        System.out.println("商品删除成功");
    } else {
        System.out.println("商品不存在");
    }
}

// 查询商品
public Product findProduct(int productId) {
    return inventory.get(productId);
}

// 更新商品信息
public void updateProduct(int productId, String name, double price, int quantity) {
    Product product = inventory.get(productId);
    if (product != null) {
        if (name != null && !name.trim().isEmpty()) product.setName(name);
        if (price > 0) product.setPrice(price);
        if (quantity >= 0) product.setQuantity(quantity);
        System.out.println("商品信息更新成功");
    } else {
        System.out.println("商品未找到");
    }
}

// 显示所有商品
public void displayAllProducts() {
    if (inventory.isEmpty()) {
        System.out.println("库存为空");
    } else {
        System.out.println("当前库存列表：");
        for (Product p : inventory.values()) {
            System.out.println(p);
        }
    }
}

}

import java.util.Scanner;
<p>public class Main {
public static void main(String[] args) {
InventoryManager manager = new InventoryManager();
Scanner scanner = new Scanner(System.in);
boolean running = true;</p><pre class="brush:java;toolbar:false;">    while (running) {
        System.out.println("\n--- 库存管理系统 ---");
        System.out.println("1. 添加商品");
        System.out.println("2. 删除商品");
        System.out.println("3. 查询商品");
        System.out.println("4. 更新商品");
        System.out.println("5. 查看所有商品");
        System.out.println("6. 退出");
        System.out.print("请选择操作：");

        int choice = scanner.nextInt();

        switch (choice) {
            case 1:
                System.out.print("输入ID: ");
                int id = scanner.nextInt();
                System.out.print("输入名称: ");
                String name = scanner.next();
                System.out.print("输入价格: ");
                double price = scanner.nextDouble();
                System.out.print("输入数量: ");
                int qty = scanner.nextInt();
                manager.addProduct(new Product(id, name, price, qty));
                break;

            case 2:
                System.out.print("输入要删除的商品ID: ");
                int delId = scanner.nextInt();
                manager.removeProduct(delId);
                break;

            case 3:
                System.out.print("输入商品ID: ");
                int findId = scanner.nextInt();
                Product p = manager.findProduct(findId);
                if (p != null) {
                    System.out.println("找到商品：" + p);
                } else {
                    System.out.println("商品未找到");
                }
                break;

            case 4:
                System.out.print("输入商品ID: ");
                int updateId = scanner.nextInt();
                System.out.print("新名称（留空不修改）: ");
                String newName = scanner.next();
                if (newName.equals("null")) newName = null;

                System.out.print("新价格（0不修改）: ");
                double newPrice = scanner.nextDouble();

                System.out.print("新数量（-1不修改）: ");
                int newQty = scanner.nextInt();

                manager.updateProduct(updateId, newName, newPrice, newQty == -1 ? manager.findProduct(updateId).getQuantity() : newQty);
                break;

            case 5:
                manager.displayAllProducts();
                break;

            case 6:
                running = false;
                System.out.println("退出系统");
                break;

            default:
                System.out.println("无效选择，请重试");
        }
    }
    scanner.close();
}

}