Hi,
1. null is not java keyword but this is reserved word.
you can go and check more
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/_keywords.html 2. final modifer
u can't modify value if u use final modifer in variable
u can't override method if u use final modifer in a method
u can't extends class if u use final modifer in a class
3. static
1. its initilize first in a class if u use static keyword
2. u dont need to create instance if use static keyword
if u understand then ok otherwise can mail me
take care
aftab