This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
It means a list of <<Anything>>. It is called as a wild card. The super class to all Generic collections is not Collection<Object> but a Collection<?>.May be this link could help you understand better.