hehe, I doubt you are stupid; you are just not familiar (yet) with the JavaDoc structure. But trust me, after you start using it a bit you'll really appreciate the depth of documentation available to you. If you plan on doing any serious
java development, learning how JavaDoc works is *crucial*.
The top-left panel is a list of all the packages documented; if you don't know which package a class belongs to, you can just choose "All Classes" and you'll get an alphabetical list of all the classes documented in the list on the lower left. The right side of the screen has the API docs for the class you have selected on the left. The docs are broken into various sections giving an overview of the class, its fields, constructors, and a list of all its methods which you can click on to get a detailed description.
Note, JavaDoc is a
reference tool, not a tutorial. If you need a tutorial on an API, try looking for one here first:
http://java.sun.com/docs/books/tutorial/