试图洗牌“甲板”课程，似乎并没有改变

Question

我写了一个Deck课程，现在必须将其洗牌，然后打印出几只手来检查它是如何工作的。然而，它似乎并没有改变任何东西，而是提供完全相同的套牌。

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。

看起来你需要将deck对象传递给swapCards方法。

swapCards（）指的是卡阵列。目前尚不清楚这个数组的声明位置。相反，你应该将deck传递给这个方法并交换deck.cards [first]和deck.cards [swap]。