You are asking questions and making the mistakes of someone that has
little comprehension of programming. It is as if you are just trying
to get the answers to get you to pass without actually
comprehending.
--->I recommend this: either purchase or check your local library
for these books, and read them, in this order: Absolute Beginner's
Guide to Programming by Greg Perry, Sams Teach Yourself Java2 in 24
Hours, and finally Sams Teach Yourself Java 2 in 21 Days.
---> If you feel that you do not want/need a foundational
understanding of programming... then go to the library and check out
the Java 2 in 21 days and use the index to answer your questions.