import java.util.Arrays;

public class UpdateArray
{
    public static void main(String[] args)
    {
        int[][] myGrid = { {1,2,3},
                           {4,5},
                           {6,7,8,9} };
        increment(myGrid);  // This method will update elements in myGrid

        System.out.println( Arrays.toString(myGrid[0]) ); // [2,3,4]    changed !
        System.out.println( Arrays.toString(myGrid[1]) ); // [5,6]      changed !
        System.out.println( Arrays.toString(myGrid[2]) ); // [7,8,9,10] changed !
    }

    public static void increment(int[][] m) 
    {

	for (int i = 0; i < m.length; i++) 
	    for (int j = 0; j < m[i].length; j++)
	        m[i][j]++;;
    }  
}