Java - Printing a maze using a formatted Stringbuilder - printing

Question

I would like to create a maze with a StringBuilder that must have a certain format to match a specific output. I am using the following code to do that, but it shaves off the first row of the output.
The given example is a single string that looks like this:
final String EXAMPLE01 = "############## ## ############ # # ## # # ##### ## # # # ## ### # # # ## # # # # #### # # # # ## # # #### ####### ## ##############";
Here is the code to format the string:
private void init(Maze z) {
/**
* initializes de.uniwue.gdp.labyrinth.Explorer
*/
maze = z; //set maze
pov = POV.SOUTH; //set default point of view to South
idx = maze.width() + 1; //set default index to (1,1) || starting index
str = new StringBuilder(); //init empty StringBuilder
for (int i = 0; i < maze.width() * maze.height(); ++i) {
if (str.length() != 0 && (str.length() % maze.width() == 0)){ //use modulo to find linebreaks
str.append("\n");
}
str.append('#'); //set all fields to not explored or wall
}
str.setCharAt(idx, ' '); //set starting field to explored
updateDirections(); //init numMarks & validDirections
}
the output looks like this:
But should look like this:
Thank you very much in advance!

Answer 1

On this line:
for (int i = 0; i < maze.width() * maze.height(); ++i)
Try i++ instead of ++i.
'++' before 'i' increments it prior to evaluation '++' after 'i' increments it after evaluation. In the case the loop may be starting at 1 instead of 0.