public static boolean isDiagonalMagic(int[][] a){
        int diagonalL2R = 0;
        int length = a.length;
        int diagonalR2L = 0;

        for (int i = 0; i < a.length; i++) {
            diagonalL2R += a[i][i];
        }
        for (int i = 0; i < a.length; i++) {
            for (int j = length - 1; j >= 0 ; j -= length) {
                diagonalR2L += a[i][j];
            }

        }
        if (diagonalL2R == diagonalR2L) {
            return true;
        }
        return false;
    }