Java用一个数组填充多个数组

Question

我有一个数组，其中包含一副牌中的所有 52 张牌。

ImageIcon[] cards = {aceSpadesIcon, twoSpadesIcon, ... }

然后我打乱该数组

for(int i = 0; i < cards.length; i++)
{
    int r = (int)(Math.random()*(i+1));
    ImageIcon swap = cards[r];
    cards[r] = cards[i];
    cards[i] = swap;
} 

现在我创建四个新数组来填充卡片数组。

ImageIcon[] row1 = new ImageIcon[13];
ImageIcon[] row2 = new ImageIcon[13];
ImageIcon[] row3 = new ImageIcon[13];
ImageIcon[] row4 = new ImageIcon[13];

现在我用现在的随机卡片数组填充这些数组

int j = 0;  
            while(j < cards.length)
            {
                if(j <= 13)
                {
                    Arrays.fill(row1, cards[j]);
                    j++;
                }
                else if(j <= 26)
                {
                    Arrays.fill(row2, cards[j]);
                    j++;
                }
                else if(j <= 39)
                {
                    Arrays.fill(row3, cards[j]);
                    j++;
                }
                else
                {
                    Arrays.fill(row4, cards[j]);
                    j++;
                }
            }

然后我将其显示在 Swing 窗口中，但出现一些错误。我应该有 4 行，每行 13 张不同的随机卡，但我得到 4 行，每行 1 张随机卡显示 13 次。如何修复我的循环，以便它用不同的卡片填充数组？

Answer 1

使用 System.arraycopy 填充行:

public static void main(String[] args) {
    Integer[] allCards = new Integer[52];
    for (int i = 0; i < allCards.length; i++) {
        allCards[i]=i;
    }
    List<Integer> cardList = new ArrayList<Integer>(Arrays.asList(allCards));
    Collections.shuffle(cardList);
    Integer[] cards = cardList.toArray(allCards.clone());

    Integer[] row1 = new Integer[13];
    Integer[] row2 = new Integer[13];
    Integer[] row3 = new Integer[13];
    Integer[] row4 = new Integer[13];

    int index = 0;
    System.arraycopy(cards, index, row1, 0, 13);
    index+=13;
    System.arraycopy(cards, index, row2, 0, 13);
    index+=13;
    System.arraycopy(cards, index, row3, 0, 13);
    index+=13;
    System.arraycopy(cards, index, row4, 0, 13);

    System.out.println(Arrays.toString(cards));
    System.out.println(Arrays.toString(row1));
    System.out.println(Arrays.toString(row2));
    System.out.println(Arrays.toString(row3));
    System.out.println(Arrays.toString(row4));


}