I hear you but you are missing the point. Not everybody is a genius and
some of us are also short on money. Most Java books are focused and don't
provide all the information across the board. The part about learning different
angles from different books is great, but that is once you get past the first
few months. My point is that some people (maybe not as bright as you) sometimes
need to know a bit more in depth, what new terms mean, in order to move  on
ahead within their comfort level. It is those people (like me) that benefit from
Java Power Source. You would be surprised to know how many of us there are.
Amazon has many many books on Java. Regarding less spam making you more money
congratulations (you must be rich by now) but I fail to see how my email could
have cost you a penny in the spirit it was delivered. The significance of this
book is that it gives an overview from syntax to design and can help  new people
to clarify early and move on instead of waiting with growing number of terms
hanging over our head and making us nervous. Just as books are different so are
people. I joined a number of JUG recently as I got a renewed confidence in
Java. I expect I will find  a lot of helpfull info and I wanted to share what
enabled me to get back. If I am not welcome in this JUG