Concepts:-
- Opps concept
- Multithreading
- Design patterns
- J2EE principles eg Servlets and JSP’s
- Design Patterns
I can suggest some books for learning the same:-
- SCJP6 by Kathy Sierra
- Head Frist Sevlets and JSP
- Head First Design Patterns
- Concurrency in Practice
- The Pragmatic Programmer
