1) From four to eight months depending of your previous programming experience (for example, OOP or no OOP?) and also depending on what score you want to pass the exam with (71% or 100%).
2) For the SCPJ2 exam, these two:
a)
The Complete Java 2 Certification Study Guide by Simon Roberts, Philip Heller, Michael Ernest.
b)
Java 2 (Exam Cram) by William Brogden.
And if you can find an old copy of Barry Boone's Java 1.1 Certification book,
you should study it also.
3) For e-commerce, you will need to know
Servlets and JSPs. Depending on which tier of the Enterprise system you work on, EJBs (Enterprise Java Beans) XML,
JDBC and RMI. There's a book which I like (actually two):
a)
Mastering Enterprise JavaBeans and the Java 2 Platform, Enterprise Edition by Ed Roman, and
b)
Professional Java Server Programming: with Servlets, JavaServer Pages (JSP), XML, Enterprise JavaBeans (
EJB), JNDI, CORBA, Jini and Javaspaces.
