Aside on Java objects vs. other Mathematica expressions

In Mathematica, we are used to looking inside expressions and extracting parts of them, e.g.,

But this does not work with the symbols that contain Java objects whose internal structure is not visible in Mathematica:

Hence the need to learn about their Java methods.  However we can do this inside Mathematica.

Created by Wolfram Mathematica 6.0  (05 November 2007)