Question to experienced java developer

Hi all

Could anyone please tell me the topics needed to be a core java developer.

1. JAVA OO
2. DESIGN PATTERN
3. JAVA NIO
4. THREADS
5. SWING , AWT, EVENT , LISTENER ETC.

WHAT ELSE IS REMAINED. is there anything else which is PRACTICALLY required to be a expert core java developer.
thankyou

check out SCJD topics on focus so that you can get an idea of what it needs to be a core java developer.