This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
Well, Arnold, one of the exam objectives regarding the collections framework states:
Make appropriate selection of collection classes/interfaces to suit specified behavior requirements.
So, based on that, I'd say you'd be well off to know some of the benefits and constraints of the different collections. Extreme details probably aren't important, but knowing the basic structure of the collections would definitely be a good idea. Corey