I'm new in java and I'm trying to come up with a program that stimulates the bean machine(also known as Galton box) Balls are dropped from the opening of the board. Everytime a ball hits, there is a 50% chance to fall to left and 50% chance to fall to the right. the piles of balls are accumulated in the slots at the bottom of the board. I'm just trying to set up my algorithm, but I don't know how to set up my arrays. i.e, the entreis in the arrays, the Givens, results, etc. This is a Galton box and how it works in case you don't know: http://upload.wikimedia.org/wikipedia/commons/thumb/7/78/Galton_Box.svg/507px-Galton_Box.svg.png I just don't know where to start.. how to set up my arrays. Any help is appreciated.