It's good practice to only expose what is necessary. In a commercial environment this is even more important as you must support what you expose. Based on this line of thinking I would only expose classes outside of my package that need to be accessed outside of my package.
As for Java Doc comments. I would add Java Doc in exactly the same way to all my classes regardless of what the access level was on them. Reason being is that you should document all your code for other developers who come to read your code at a later point.
Agree with Sean. In practice I'd probably put a lot less effort into documenting the non-public parts, but for this assignment I documented everything to the same level (and generated Javadocs to include public, protected and package access).
Joined: Jul 17, 2011
i did document everything just that I don't want them to penalize me for my bad command of English.