数组取值哪位大神可以帮我实现一下啊

Question

String[] indexValue = {"1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42"};

随机取数组里面的值，但是个数可以是1到42位。
比如说第一次取 出来的值是1,2，3
第二次就可以是，123456789101112.。。

Answer 1

你定义的数组有问题，我帮你改过来了，你试下我写的

 public static void main(String[] args)
    {
        int[] indexValue = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42};
        int count = (int)(Math.random() * 42);
        System.out.println("取出数字个数：" + count);
        int[] resultIndex = new int[count];
        for (int i = 0; i < count; i++)
        {
            int index = (int)(Math.random() * 42);
            if (!containValue(resultIndex, index))
            {
                resultIndex[i] = index;
            }
            else
            {
                i--;
            }
        }
        for (int i = 0; i < resultIndex.length; i++)
        {
            System.out.print(indexValue[resultIndex[i]]);
            System.out.print(" ");
        }
    }

    private static boolean containValue(int[] resultIndex, int index)
    {
        for (int j = 0; j < resultIndex.length; j++)
        {
            if (index == resultIndex[j])
            {
                return true;
            }
        }
        return false;
    }