Really underhanded

[Kyorox]

I'm a junior at Whittier Tech, and lead programmer for theFRC robotics team, The Maroom Monsoon. We really need help from a little bit of everyone. Due to weather we have been set back 8 days.
It is my main priority to ask you guys for help in Java programming using mecanum wheels and the eclipse software.
Our head programmer last year was very anti-sociable and programmed the entire robot then graduated without keeping note of what he did or how.

I have a place to start,
I have been studying and reading plenty of other fourms and have been practicing myself, along with my team, but our efforts prove somewhat meaningless when our robot is so behind. We have little to no way of knowing what we are doing without having something to physically test on, and the limited amount of time remaining worries me. We had preiviously asked Reddit for advice and got some wonderful responses however, we are too inexperianced to understand exactly what has been coming through.
What I'm trying to ask is if it is possible that there is a way to test what we have without having a robot to physically do this with? We also have very to no experiance with what we have. I have been practicing with eclipse along woth some fellow classmates, but they have mainly been on code academy practicing, and writing sample programs in netbeans and now in eclipse.

Please respond as though we are a rookie team although this is our second year.
I am an Admin for this team and widely looked up too, I still need advice on many other topics of interest as well.