Bluej ArrayList 添加

Question

我正在尝试制作纸牌游戏，并准备好我的纸牌类和套牌类，它可以编译，但是当我尝试运行套牌的方法 makeDeckFull 时，我得到输出：invalidnumberinvalidnumber...

当我使用 showDeck 方法时，我会看到这个而不是“红心”，1 Cards@597f13c5（我不知道是什么意思，也不知道怎么解决）

任何帮助将不胜感激：代码如下。

甲板等级：

import java.util.ArrayList;
public class Deck
{
    private ArrayList<Cards> deck;
    private int index;

    public Deck()
    {
        deck = new ArrayList<Cards>();
    }

    public void makeDeckFull()
    {
        Cards h1 = new Cards("Hearts", 1);
        Cards h2 = new Cards("Hearts", 2);
        Cards h3 = new Cards("Hearts", 3);
        deck.add(h1);
        index ++;
        deck.add(h2);
        index ++;
        deck.add(h3);
        index ++;
        //Rest of these is left out to conserve space
    }

    public void showDeck()
    {
        System.out.println(deck); 
    }

卡类：

public class Cards
{
    private String HEARTS = "Hearts";
    private String CLUBS = "Clubs";
    private String DIAMONDS = "Diamonds";
    private String SPADES = "Spades";
    public int number;
    public String suit;
    public Cards()
    {
        suit = "unknown suit";
        number = 0;
    }

    public Cards(String suit, int number)
    {
        setSuit(suit);
        setNumber(number);

    }

    public void setCard(String suit, int number2)
    {
        setSuit(suit);
        setNumber(number2);

    }
    public void setSuit(String newSuit)
    {
        if(
            (newSuit.equalsIgnoreCase(HEARTS)) ||
            (newSuit.equalsIgnoreCase(DIAMONDS)) ||
            (newSuit.equalsIgnoreCase(CLUBS))    ||
            (newSuit.equalsIgnoreCase(SPADES)))
        {
            suit = newSuit;
        }
        else 
        {
            newSuit = "invalid";
            System.out.print("Invalid");
        }        
    }
    public int getNumber()
    {
        return number;
    }
    public String getSuit()
    {
        return suit;
    }

    public void setNumber(int newNumber)
    {

        if(newNumber >0 && newNumber <=10)
        {
            number = newNumber;
        }
        else
        {
            number = 0;
            System.out.print("invalid number");
        }
    }
}

Answer 1

1) 您需要在 Cards 类中覆盖 toString()。照原样，您正在打印出对象的引用（乱码）而不是“数据”。您还应该覆盖Deck 的toString() 方法，只打印出列表。

2) 我正在逐步检查您的代码 sn-p makeDeckFull()，它似乎工作正常。你确定这三个插入是你得到无效打印语句的地方吗？