From Miguel Paraz:
Yup. It reinforces the idea of attributes and minimizes the problem>
with same-named parameters and local variables.
(They should know that they can omit this. most of the time, but it's
still a good idea.)
Just be careful with constructors that set the field from a parameter, as in: http://www.jspwiki.org/Wiki.jsp?page=WhyUsingThisIsBad