Naming classes like "com.facebook.FacebookClient" vs "com.facebook.Client"

Question

I'm looking for opinions or if there is an agreed way of doing this, regarding to naming namespaced classes.

E.g.:

com.facebook.FacebookClient
vs
com.facebook.Client

Or

javax.script.ScriptEngine;
vs
javax.script.Engine;

I'm currently prefer the first name in each example but the extra word seems a bit wasteful.

Answer 1

Using Actionscript as an example, I'd say FacebookClient over Client. For this reason:

import com.facebook.Client;
import com.twitter.Client;

You'd have to refer to the class by it's full package to create an instance in the same class:

new com.facebook.Client();

If it was FacebookClient, I could have both

new FacebookClient();
new TwitterClient();

Plus Client would be annoying to me when code completion pops up. An extra click to select the correct Client ;)

Answer 2

I generally go with something like:

[company name].[project name].[functional area].[category]

i.e.

com.dave.megaproject.dataaccesslayer.postcodelookup

or in the .net world:

namespace DaveFirm.MegaProject.DataAccessLayer.PostCodeLookup