public class MdArrayExamples {

    public static void print2DArray(int[][] a) {
        for (int i = 0; i < a.length; ++i) {
            for (int j = 0; j < a[i].length; ++j)
                System.out.print(a[i][j] + " ");
            System.out.println();
        }
    }

    public static void print2DArray2(int[][] a) {
        for (int[] row : a) {
            for (int col : row)
                System.out.print(col + " ");
            System.out.println();
        }
    }

    public static int sumArray(int[] a) {
        int sum = 0;
        for (int i = 0; i < a.length; ++i)
            sum += a[i];
        return sum;
    }

    public static int maxRow(int[][] a) {
        int maxRow = sumArray(a[0]);
        int maxRowIndex = 0;
        for (int i = 1; i < a.length; ++i)
            if (sumArray(a[i]) > maxRow) {
                maxRow = sumArray(a[i]);
                maxRowIndex = i;
            }
        return maxRowIndex;
    }

    public static int sumColumn(int[][] a, int colIndex) {
        int sum = 0;
        for (int i = 0; i < a.length; ++i)
            sum += a[i][colIndex];
        return sum;
    }

    public static int maxColumn(int[][] a) {
        int maxCol = sumColumn(a, 0);
        int maxColIndex = 0;
        for (int i = 1; i < a[0].length; ++i)
            if (sumColumn(a, i) > maxCol) {
                maxCol = sumColumn(a, i);
                maxColIndex = i;
            }
        return maxColIndex;
    }

    public static void main(String[] args) {
        int[] a = { 1, 2, 3, 4 };
        System.out.println(a.length);

        int[][] b = { { 1, 2, 3, 4 }, { 2, 3, 4, 5 }, { 3, 4, 5, 6 } };
        System.out.println(b.length + ", " + b[0].length);

        int[][][] c = { { { 1, 2, 3, 4 }, { 2, 3, 4, 5 }, { 3, 4, 5, 6 } },
                { { 4, 5, 6, 7 }, { 5, 6, 7, 8 }, { 6, 7, 8, 9 } } };
        System.out.println(c.length + ", " + c[0].length + ", " + c[0][0].length);

        print2DArray(b);
        print2DArray2(b);

        System.out.println(maxRow(b));
        System.out.println(maxColumn(b));
    }

}