java - 我无法正确打印我的卡片对象

Question

这是我尝试显示的方法，它应该是 4x4 的卡片网格。我觉得卡片对象内部可能有问题？这是当我尝试运行 printHiddenCard 中的内容时得到的结果。

edu.cpp.cs.cs141.memgame.QCard@182decdb 
edu.cpp.cs.cs141.memgame.StarCard@26f0a63f 
edu.cpp.cs.cs141.memgame.PercCard@4361bd48 
edu.cpp.cs.cs141.memgame.PercCard@4361bd48 
edu.cpp.cs.cs141.memgame.MinusCard@53bd815b 
edu.cpp.cs.cs141.memgame.MinusCard@53bd815b 
edu.cpp.cs.cs141.memgame.PoundCard@2401f4c3 
edu.cpp.cs.cs141.memgame.QCard@182decdb 
edu.cpp.cs.cs141.memgame.SlashCard@7637f22 
edu.cpp.cs.cs141.memgame.ExclCard@4926097b 
edu.cpp.cs.cs141.memgame.StarCard@26f0a63f 
edu.cpp.cs.cs141.memgame.PlusCard@762efe5d 
edu.cpp.cs.cs141.memgame.PlusCard@762efe5d 
edu.cpp.cs.cs141.memgame.SlashCard@7637f22 
edu.cpp.cs.cs141.memgame.ExclCard@4926097b 
edu.cpp.cs.cs141.memgame.PoundCard@2401f4c3



private static int rows = 4;
private static int columns = 4;
    public static Card[][] card = new Card[rows][columns];

 public Card[][] printHiddenCard() {

    QCard c1 = new QCard();
    StarCard c2 = new StarCard();
    MinusCard c3 = new MinusCard();
    PoundCard c4 = new PoundCard();
    ExclCard c5 = new ExclCard();
    PercCard c6 = new PercCard();
    SlashCard c7 = new SlashCard();
    PlusCard c8 = new PlusCard();

    List<Card> allCards = Arrays.asList(c1, c2, c3, c4, c5, c6, c7, c8);
    List<Card> list = new ArrayList<>(allCards);
    list.addAll(allCards);
    Collections.shuffle(list);

    int counter = 0;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < columns; j++) {
            card[i][j] = list.get(counter++);
            System.out.println(card[i][j] + " ");
        }
    }
    return card;
}

这是其中一个卡片对象的样子:

public class QCard extends Card {

public QCard() {
    super("?");
}

}

这是父类(super class):

public abstract class Card {

private String cardType = "";
private boolean isFlipped = false;

public Card(String cardType) {
    this.cardType = cardType;
}

public String getCardType() {
    return cardType;
}

public boolean isFlipped() {
    return isFlipped;
}

public void setFlipped(boolean isFlipped) {
    this.isFlipped = isFlipped;
}

}

Answer 1

您应该重写要打印的对象中的 toString() 方法，如下所示:

public class QCard extends Card {
    public QCard() {
        super("?");
    }

    public String toString() {
        return "card data";
    }
}

上面的示例将始终打印卡片数据，因此请添加您想要包含在打印输出中的字段。