padmini,
You have to calm down. Relax a little. Over the last few days, you have been posting messages and marking them urgent. But you could have easily answered most of them yourself by writing a small program and trying it out. Not only do you lose out on a valuable learning opportunity by posting "urgent" questions instead, you also run the risk of not getting an answer from people who could but won't because they were ticked off by your lack of initiative.
Sorry if this sounds harsh but that's just the way things are around here.
As for your first urgent question, understanding what the
static keyword does is one of the basic requirements for
Java certification.