java - Effectively iterate over two dimensional array -

currently fiddling around 2 dimensional arrays learning purposes, , have arrived @ problem can't see solution to.

the goal build following output (see grid further down)

0.0: 0.1 1.0: 1.1 2.0: 2.1 3.0: 3.1 4.0: 4.1  0.0: 0.2 1.0: 1.2 2.0: 2.2 3.0: 3.2 4.0: 4.2 ect 

i believe have achived following piece of code.

stringbuilder sb2 = new stringbuilder(); string newline = system.getproperty("line.separator");  //grid1[0].length = 7  (int col = 0; col < (grid1[0].length - 1); col++) {         (int row = 0; row < grid1.length; row++) {             sb2.append(grid1[row][0] + ": ");             sb2.append(grid1[row][col+1] + newline);         }         sb2.append(system.getproperty("line.separator"));     }     system.out.println(sb2.tostring()); 

my question is, if it's possible achieve same goal running on array in reverse order (see below), , if more efficient way have arrived to.

for (int row = 0; row < grid1.length; row++) {    (int col = 0; col < grid1[0].length; col++) {       //something    } } 

the grid - array[5][7]

yes can, can use :

for (int row = grid1.length - 1; row >= 0; row--) {     (int col = grid1[0].length - 1; col >= 0; col--) {         ...     } } 

edit

i tried , show me :

int grid1[][] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; (int row = grid1.length - 1; row >= 0; row--) {     (int col = grid1[0].length - 1; col >= 0; col--) {         system.out.print(grid1[row][col]+ " ");     }     system.out.println(); }  9 8 7  6 5 4  3 2 1  

instead of :

1 2 3 4 5 6 7 8 9