This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Java has the reflection API, which allows a running JVM to ask about the classes it contains, and about their methods and their fields. If you ask the reflection API what type a void method returns, it will return the static field Void.TYPE . That is the only purpose of the Void class.