當我嘗試調用超級構造函數時，復制構造函數生成錯誤

Question

為我的 class 編寫復制構造函數時，我收到一條錯誤消息，我做錯了什么？

public class SaleItem extends Item {
double price;
double shippingCost;
int numItems;


public SaleItem(SaleItem toCopy){

    this.price = toCopy.price;
    this.shippingCost = toCopy.shippingCost;
    this.numItems = toCopy.numItems;
}
public SaleItem(String name, String description, double price, double shippingCost, int numItems){
   super(name, description);
    this.price = price;
    this.shippingCost= shippingCost;
    this.numItems = numItems;
}

Answer 1

您應該將該屬性聲明為protected ，例如：

public class Item {

    protected String description;
    protected String name;

    public Item(){}

    public Item(String description, String name){
        this.description = description;
        this.name = name;
    }
    //Getter and setters...

}