I'm working on a simulator and editor for the great cellular automaton WireWorld.

There's a two-dimensional array called 'cells' which stores the states of the cells in the grid: 0 for off, 1 for wire, 2 for electron head, and 3 for electron tail.

Currently, it needs to save the states of each cell to a file. Here's my code (please pardon my sloppy, inefficient code... if there is a way to generate an array on the fly without a variable, could someone please tell me?):

1.     String[] toSave = new String[rows];
2.     for (int i = 0; i < rows; i++) {
3.       for (int j = 0; j < cols; j++) {
4.         String[] toAppend = new String[2];
5.         toAppend[0] = toSave[i];
6.         toAppend[1] = nf(cells[i][j], 1);
7.         toSave[i] = join(toAppend, ',');
8.       }
9.     }
10.     saveStrings("wireworld.txt", toSave);