This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Do you happen to be calling getAnswer(), without a parameter? Because, that would be your problem.
Your method needs to be passed an int in order for it to work. However, in this case, you shouldn't be using a parameter at all, since all you are doing is assigning something to it. Declare the int inside your method.