Question

在下面的代码中我得到了ArrayIndexOutOfBoundsException。我是Java的新手，没有得到导致它超出界限的线索。我调试此代码，输入4个条目后终止。

        String[] suit = {"Clubs", "Diamonds", "Hearts", "Spades"};
        String[] rank = {"2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen", "King", "Ace"};
        String[] deck = new String[suit.length * rank.length];

        int i = (int)(Math.random()*rank.length);
        int j = (int)(Math.random()*suit.length);

        System.out.println(rank[i]+" of "+suit[j]);         

        for(int k=0; k<suit.length; k++){
            for(int l=0; l<rank.length; l++){
                //on the following line.
                deck[rank.length*k + l] = rank[k]+ " of "+suit[l];
            }
        }

        for(String s : deck){
            System.out.println(s);
        }

Answer 1

我很确定你把这些变量混淆了

deck[rank.length*k + l] = rank[k]+ " of "+suit[l];

应该是

deck[rank.length*k + l] = rank[l]+ " of "+suit[k];

Answer 2

问题的原因是您应该使用k索引而不是l：

   deck[rank.length*k + l] = rank[k]+ " of "+suit[l];

像这样：

    deck[rank.length*k + l] = rank[k]+ " of "+suit[k];

因为rank.length > suit.length因为此索引suit[4]中的数组中没有数据。

获取ArrayIndexOutOfBoundsException，数组大小是动态确定的

2 个答案: