private static int solve2(String s) {
        String[] a = s.split("\n");
        int sum = 0;
        for (int i = 0; i < a.length; i++) {
            String[] aa = a[i].split("\t");
            if (aa.length == 0)
                continue;
            for (int j = 0; j < aa.length; j++) {
                int current = Integer.parseInt(aa[j]);
                for (int k = j + 1; k < aa.length; k++) {
                    int current1 = Integer.parseInt(aa[k]);
                    if (Math.max(current, current1) % Math.min(current, current1) == 0) {
                        sum += (Math.max(current, current1) / Math.min(current, current1));
                        break;
                    }
                }
            }
        }
        return sum;
    }
Why Did you create this class? what does it do?
src/adventofcode/CheckSUm_2.java