重复数组中的值并进行洗牌

Question

我在Java中洗牌二维数组时遇到问题。有10张底牌。

这是阵列：

String[][] Cards = new String[][] {
        {"CardType1","CardName1","CardProperties"},
        {"CardType1","CardName2","CardProperties"},
        {"CardType1","CardName3","CardProperties"},
        {"CardType2","CardName4","CardProperties"},
        {"CardType2","CardName5","CardProperties"},
        {"CardType2","CardName6","CardProperties"},
        {"CardType2","CardName7","CardProperties"},
        {"CardType3","CardName8","CardProperties"},
        {"CardType3","CardName9","CardProperties"},
        {"CardType3","CardName10","CardProperties"}
        };

每张牌必须复制4次，才能完成一副40张牌的牌组，然后洗牌。如何使用Java来实现这一点？

Answer 1

首先，你有点物体恐惧症。让我们从卡片类型的枚举开始：

public enum CardType {
    TYPE_1,
    TYPE_2,
    TYPE_3,
    //etc...
    ;
}

不确定卡片名称是什么，但让我们把它作为一个String。也不确定卡片属性是什么——让我们称之为地图

public class Card {
    private final CardType cardType;
    private final String cardName;
    private final Map<String, String> properties = new HashMap<>();

    Card(final CardType cardType, final String cardName) {
        this.cardType = cardType;
        this.cardName = cardName;
    }

    public Card setProperty(final String name, final String value) {
        properties.put(name, value);
        return this;
    }

    public String getProperty(final String name) {
        return properties.get(name);
    }
}

添加getter和setter，以及toString、equals和hashCode方法。可能使卡实现可比性

所以要创建一个Card，您可以调用：

final Card card = new Card(CardType.TYPE_1, "CardName1");

要设置属性，因为该方法是可链接的，所以可以执行以下操作：

final Card card = new Card(CardType.TYPE_1, "CardName1").
        setProperty("prop1", "thing").
        setProperty("prop2", "stuff");

现在，要创建牌组，每种类型需要4张牌，这很简单。使用Java 8：

final List<Card> deck = Stream.of(CardType.values()).
        flatMap(type -> IntStream.rangeClosed(1, 4).mapToObj(num -> new Card(type, "CardName" + num))).
        collect(toList());

Java 8之前版本要创建列表，可以使用显式循环：

final List<Card> deck = new LinkedList<>();
for (final CardType cardType : CardType.values()) {
    for (int i = 1; i <= 4; ++i) {
        final Card card = new Card(cardType, "CardName" + i);
        deck.add(card);
    }
}

要洗牌集合，只需使用集合即可。洗牌像这样：

Collections.shuffle(deck);