Enthuware

The API has the remove() method for the Map interface defined as such:

remove(Object key)
Removes the mapping for a key from this map if it is present (optional operation)

For the Collection interface we get this:

remove(Object o)
Removes a single instance of the specified element from this collection, if it is present (optional operation).

Finally, in option #3 we have this rendering for the method:

remove(Object o)

I ask why the setup above is compatible with the answer "The Map interface defines the methods remove()..." . It would seem that the method as rendered above (and in option #3) is closer to Collection than it is to Map.

I am not sure I understand your question. If you are talking about key and o, then parameter names are irrelevant.
-Paul.