If you want a book on network programming, there are a few classic choices. [Comer’s] TCP/IP books are a great reference but sometimes is too low level. “Unix Networking Programming&#82… ...

“Beej’s Guide to Network Programming: Using Internet Sockets,” by Brian “Beej” Jørgensen. “Windows Sockets: A Quick and Dirty Primer,” by Jim Frost.

A Java developer must also be able to think and code using the declarative functional paradigm. This tutorial presents the basics of functional programming.