public int[][] flipAndInvertImage(int[][] a) {
        if (a == null || a.length == 0)
            return a;
        for (int i = 0; i < a.length; i++) {
            rinvert(a, i);
        }
        return a;
    }
Why Did you create this class? what does it do?
src/problems/easy/FlippinganImage.java