A few years ago, I stumbled across a utility (written in Java, I
believe) which allowed you to input information such as class title,
time, instructor, building, room, etc, and it then generated a
printable weekly schedule, with the class times colored in on a weekly
schedule.  Anyone who can provide me with a link to a free utility
which allows this kind of input, and which provides a clear and
informative output would be very helpful.

Hello.

I believe that I've located an online class schedule utility that will
meet your needs.

Schedule Maker v0.1
http://www.stwing.upenn.edu/~wlovas/schedmaker.php

It doesn't have separate field entries for building and instructor,
but it seems to match your description in every other way. It is a
free, online, java-based and generates weekly color schedules. If you
wish to include building and instructor, you could simply include them
in each class description (e.g., "Economics - Evans Hall - Prof.
Smith").

search strategy:
"schedule maker", class

I hope this meets your needs.  If not, please let me know via the
"request clarification" feature, and I will resume my search.