java - 尝试对 "Deck"类进行洗牌，但似乎没有进行洗牌

Question

我已经编写了一个 Deck 类，现在必须对其进行洗牌，然后打印出几手牌来检查它是如何工作的。然而，它似乎并没有洗牌任何东西，而是给出了完全相同的牌组。

public void makeHands () {
    Deck deck = new Deck ();
    Deck shuffled = shuffleDeck (deck);
    printDeck (subdeck (shuffled, 0, 4));
    printDeck (subdeck (shuffled, 5, 9));
    printDeck (subdeck (shuffled, 10, 14));
    printDeck (subdeck (shuffled, 15, 19));
}

public static int randomInt (int length, int i) {
    double x = Math.random () * length;
    int g = (int) x;
    return g;
}

public Deck shuffleDeck (Deck deck) {
    for (int i=0; i<deck.cards.length; i++) {
        int g = randomInt (deck.cards.length, i);
        swapCards (i, g);
    }
    return deck;
}
}


public void swapCards (int first, int swap) {
         Card temp = cards[first];
         cards[first] = cards[swap];
         cards[swap] = temp;
}

Answer 1

代码看起来不完整。

看起来您需要将牌组对象传递给 swapCards 方法。

swapCards() 指的是卡片数组。目前还不清楚这个数组是在哪里声明的。相反，您应该将牌组传递给此方法并交换牌组.cards[first]和牌组.cards[swap]。