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.
Actually yes, Java IO can read a PDF (after all it's simply a byte). If you want to display it, then arvind s provides the best answer. If you want to manipulate the Objects or even add to it, take a look at iText or etymon for help and guidance.