TIMING

issues question1
array vs arraylist
waitList.get(0)==null NO!!! use .size() 
local,local variables
you cant use for each to set to null
remove and get

2:
get/
Super must be the first line in constructor, method headers must be right, declaring instance variables read question 2b

Index a + 2 b + 2 equals equals null doesn't work, minus equals is your friend