Just wondering if there is an easy way to get a grip on the contents of the
Java libraries short of reading the documentation for each class. I just
want a quick reference with short descriptions on the general functionality
the libraries provide, not the exact syntax and retun values. Some examples
of the intended usage could probably be useful too.

I don't find browsing the class-tree optimal either, I'd like a more
graphical layout if at all possible. I kinda feel like I'm sitting on a
treasure of useful stuff, but can't figure out how to reach it :-)