Need to Know More?
Campione, Mary, Kathy Walrath, Alison Huml. The Java Tutorial: A Short Course on the Basics, Third Edition. Addison-Wesley, Boston, MA, 2000. ISBN 0201703939. A convenient bound version of Sun's online tutorial.
http://java.sun.com/docs/books/jls/ is where the definitive Java language specification document is maintained in HTML form. This document has also been published as ISBN 0201310082, but most programmers will find the online documentation to be sufficient.
http://java.sun.com/docs/books/vmspec/2nd-edition/html/VMSpecTOC.doc.html is where the definitive JVM specification in the most current edition is maintained. It has detailed sections on the representation of primitive values such as interpretation of the strictfp modifier.