大小写字母放进数组

大小写字母都放进数组内

char[] array = new char[52];//26+26=52
        int j = 0;
        for (int i = 0; i < array.length; i++) {
            int number3 = r.nextInt(9);
            if (i < array.length / 2) {
                array[i] = (char) (97 + i);
            } else {
                array[i] = (char) (65 + j);
                j++;
            }

        }