101 「配列修羅道」 Step09 解答例

Product.java（setStock追加）

public class Product {
    private String name;
    private int stock;

    public Product(String name, int stock) {
        this.name = name;
        this.stock = stock;
    }

    public String getName() {
        return name;
    }

    public int getStock() {
        return stock;
    }

    // 在庫数を更新するsetterメソッドを追加
    public void setStock(int stock) {
        this.stock = stock;
    }
}

ProductUtil.java

import java.util.ArrayList;

public class ProductUtil {
    public static void updateStockByName(ArrayList<Product> products, String keyword, int newStock) {
        boolean found = false;

        for (int i = 0; i < products.size(); i++) {
            Product p = products.get(i);
            if (p.getName().equals(keyword)) {
                p.setStock(newStock);  // 在庫を更新
                System.out.println(p.getName() + "の在庫数を" + newStock + "に更新しました");
                found = true;
                break;
            }
        }

        if (!found) {
            System.out.println("該当商品なし");
        }
    }
}