Should I use “this” keyword when I want to refer to instance variables within a method?

Question

My teacher says that when I try to access an instance variable within a method I should always use the this keyword, otherwise I would perform a double search.

Answer 1

You must use this if required because of a name conflict, though it's better to avoid those entirely.

You may use this if you desire. It is purely a matter of taste.

You should use this in your schoolwork if your teacher demands it.