This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
I had a question about collections. We have Set, List, Map which are interfaces and HashSet, ArrayList, HashMap,... which are the classes that are implement this interfaces.
What about the Collection? I had the impression that was an interface but I found it to be a class. What is a class or interface?