> On Apr 2, 2018, at 4:09 PM, Stewart Aitken <[log in to unmask]> wrote: > > When I make width equal or larger than height it works just as expected. > But once reversed it gives this out of bounds error and I just wondered if it could be a JAVA bug rather than this code. ObjectGrid2D is simple. On initialization it contains: 1. A WIDTH instance variable. 2. A HEIGHT instance variable. 3. A 2D array of Objects which is [WIDTH] by [HEIGHT] If you do new ObjectGrid2D(5, 6) ... you'll get a 2D array which is 5x6. If you do new ObjectGrid2D(6, 5) ... you'll get a 2D array which is 6x5. There's nothing special about this at all. This tells me that it almost certainly has to be a bug in your code. However your code only calls new ObjectGrid(...) once and doesn't seem to do anything special with it. So it's got to be somewhere *else* in your code. Sean