I think any
SCJP can start preparing for
SCJD exam if he/she is dedicated considering time limit is one year. But before being an SCJD he/she has to aquire the following technical capabilities. Please add something more if you find appropriate or suggest to deduct a few from the list.
•Knowledge of Swing
•Sound knowledge on either RMI or Socket Programming
•Multi-Threading, Lock Management and Synchronization
•File I/O
•Standard Design
Patterns used in the Industry
•Javadoc tool
•Jar Mechanism
•Maintaining Platform Independence
•Standard Coding Conventions and Clarity
•
Testing Capability
•Logically express reasoning and defending own codes
•A few years industry experience with
Java Thank you.