public class Demo2
{
   public static void main(String[] args)
   {
       double[][] myGrid = { {1, 2, 3},
                             {4, 5},
			     {6, 7, 8, 9} };
       double     sum; // sum = 1+2+3+4+5+6+7+8+9

       // Compute sum = sum all elements in array myGrid

       sum = 0;
       for ( int i = 0; i < myGrid.length; i++ )
           for ( int j = 0; j < myGrid[i].length; j++ )
               sum = sum + myGrid[i][j];
            
       System.out.println("sum = " + sum);
   } 
}