Adding a array in order to graph frequency of numbers

I am building a simulation for the game of craps, below is my code to run through the process of rolling, along with a dice Class that executes the random rolls. I want to be able to graph the distribution of the rolls. For that, I believe I need to but the random rolls into an array, can anyone help I have been stuck for awhile.

I have attached my worlk thus far, apologies if there are anys oddities.