Java 找不到符号 - 包含键(项目)

Question

在我的超市结账程序中，当我运行它时，它在addItem方法的Checkout类中出现此错误：

找不到符号 - 方法包含键（项目）

我不明白为什么会出现此错误，因为我已经检查了其他两个类（Item 和 Stock ），我看不出它们有什么问题。

以下是课程：

import java.text.NumberFormat;
import java.util.HashMap;
public class Checkout {
    private HashMap<Item, Integer> stock;
    /**
     * Constructor for objects of class Checkout. Instantiates the checkout.
     */
    public Checkout() {
        stock = new HashMap<Item, Integer>();
    }

    public void addItem(String itemCode) {
        Stock stock = new Stock();
        if (stock.containsSalesItem(itemCode)) {
            Item item = stock.getItem(itemCode);
            int quantity = 1;
            if (stock.containsKey(item)) {
                Integer quantity = stock.get(item);
                quantity += quantity.intValue();
            }
            stock.put(item, new Integer(quantity));
        }
    }
}

---

import java.text.NumberFormat;
public class Item {
    private String name;
    private String code;
    private int price;
    /**
     * Constructor for objects of class Item
     */
    public Item(String itemName, String itemCode, int costOfItem) {
        name = itemName;
        price = costOfItem;
        code = itemCode;
    }
    public int getPrice() {
        return price;
    }
    public String getName() {
        return name;
    }
    public String getCode() {
        return code;
    }
}

---

import java.util.Map;
import java.util.HashMap;
import java.util.Collection;
public class Stock {
    private static Map<String, Item> stock;
    static {
        stock = new HashMap<String, Item>();
        stock.put("001", new Item("Diet Coke 1l Bottle", "001", 299));
        stock.put("002", new Item("Haribo", "002", 100));
        stock.put("003", new Item("Digestive Biscuits", "003", 120));
        stock.put("004", new Item("Teacakes", "004", 80));
        stock.put("005", new Item("Bacon", "005", 399));
        stock.put("006", new Item("Bread", "006", 213));
    }
    public Collection<Item> getItems() {
        return stock.values();
    }
    public Item getItem(String itemCode) {
        return stock.get(itemCode);
    }
    public boolean containsSalesItem(String itemCode) {
        if (stock.containsKey(itemCode)) {
            return stock.containsKey(itemCode);
        } else {
            return false;
        }
    }
} 

感谢您的任何帮助和建议。

Answer 1

您的Stock类没有containsKey()方法