This week's book giveaways are in the iOS and Features new in Java 8 forums. We're giving away four copies each of Barcodes with iOS: Bringing together the digital and physical worlds and Core Java for the Impatient and have the authors on-line! See this thread and this one 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.