Thread: Are Exceptions effective?

Hi all,
I have just learned a lot about "Exceptions" (from Bruce Eckel's book, by the way). But I have read that I should not use them very often because they are very difficult to processing, thus little effective.
And now, I am confused. It is so nice and clear to use Exceptions in the code BUT they are "time-consuming".
So should I use them? Or should I use them everywhere, or somewhere, or should I try to avoid them?

Thanks.