Question

我已经创建了52张要添加到我的ArrayList的卡，唯一的问题是当我尝试获取列表中的第一项时，我可以进行outofboundserror，因为我不认为有任何内容已添加到我的ArrayList中。 / p>

private ArrayList<Card> deck;

public Deck() {
    deck = new ArrayList<Card>();
    for(int i = 1; i < 14; i++) {
        if(i == 1){
            Card c = new Card("Ace", "Hearts");
        }
        else if(i < 11 && i > 1) {
            Card c = new Card("" + i, "Hearts");
        }
        else if(i == 11) {
            Card c = new Card("Jack", "Hearts");
        }
        else if(i == 11) {
            Card c = new Card("Queen", "Hearts");
        }
        else if(i == 11) {
            Card c = new Card("King", "Hearts");
        }
    }

    for(int i = 1; i < 14; i++) {
        if(i == 1) {
            Card c = new Card("Ace", "Clubs");
        }
        else if(i < 11 && i > 1) {
            Card c = new Card("" + i, "Hearts");
        }
        else if(i == 11) {
            Card c = new Card("Jack", "Clubs");
        }
        else if(i == 11) {
            Card c = new Card("Queen", "Clubs");
        }
        else if(i == 11) {
            Card c = new Card("King", "Clubs");
        }
    }

    for(int i = 14; i < 1; i--) {
        if(i == 11) {
            Card c = new Card("King", "Diamonds");
        }
        else if(i == 11) {
            Card c = new Card("Queen", "Diamonds");
        }
        else if(i == 11) {
            Card c = new Card("Jack", "Diamonds");
        }
        else if(i < 11 && i > 1) {
            Card c = new Card("" + i, "Diamonds");
        }
        else if(i == 1) {
            Card c = new Card("Ace", "Diamonds");
        }
    }

    for(int i = 14; i < 1; i--) {
        if(i == 11) {
            Card c = new Card("King", "Spades");
        }
        else if(i == 11) {
            Card c = new Card("Queen", "Spades");
        }
        else if(i == 11) {
            Card c = new Card("Jack", "Spades");
        }
        else if(i < 11 && i > 1) {
            Card c = new Card("" + i, "Spades");
        }
        else if(i == 1) {
            Card c = new Card("Ace", "Spades");
        }
    }
}

我如何将其添加到我的ArrayList？

Answer 1

要将牌添加到牌组，您需要拨打

deck.add(c);

顺便说一下，使用循环并检查循环中的一个值是没有意义的。你可以只调用一行代码。

List<Card> deck = new ArrayList<>();
for (String suit : "Hearts,Clubs,Diamonds,Spades".split(",")) {
   deck.add(new Card("Ace", suit));
   for (int i = 2; i <= 10; i++)
       deck.add(new Card("" + i, suit));
   deck.add(new Card("Jack", suit));
   deck.add(new Card("Queen", suit));
   deck.add(new Card("King", suit));
}

将我的项添加到ArrayList

1 个答案: