今天無意中發現這個O'Reilly Java電子書的網址
http://www.unix.org.ua/orelly/java-ent/
包含了很多Java暢銷書整本書的線上版，雖然不是最新版的內容，但很多基礎的東西還可以參考，至少很多範例程式碼可以直接copy & paste就可以練習了，對於學習Java技術的人來說應該很有幫助。

Java™ Enterprise in a Nutshell, by David Flanagan, Jim Farley, William Crawford, and Kris Magnusson

Java™ in a Nutshell, Third Edition, by David Flanagan

Java™ Foundation Classes in a Nutshell, by David Flanagan

Enterprise JavaBeans™, Second Edition, by Richard Monson-Haefel

Java™ Servlet Programming, by Jason Hunter with William Crawford

Java™ Security, by Scott Oaks

Java™ Distributed Computing, by Jim Farley

內容說明可以參考http://press.oreilly.com/pub/pr/665