The extent to ehich
you should do javadoc depends on you.
I dont think that u have to document member and class variables.
but yes if you have an interface where you ahve some variables that u will have to add in javadoc.
in case of your other problem,about documenting innerclasses, i guess that will come under the category of commenting your code and not under javadoc
I hope i have cleared you enough..
Best of luck