I've never really been the best at explaining how Java code works in detail, so I was hoping that someone may be able to

[answerhappygod]

I've never really been the best at explaining how Java code
works in detail, so I was hoping that someone may be able to help
me out in my situation. How exactly would I explain how each
of these java classes work step-by-step? Also, how would I
explain the Big O runtime/space efficiency of my program
and WHY using ADT's make this program better in tangible
ways.
//GraphWD.java interface
//Family.java
//AdjList.java
//TreeDriver.java