Cleaned up file names which were corrupted 
by Wikiacademia during file upload.
 $ mv primitivedoc.txt PrimitiveDoc.txt
 $ mv lightwatcher.java LightWatcher.java
 $ mv primitivewatcher.java PrimitiveWatcher.java
 $ mv stoptimer.java StopTimer.java
 $ mv primitivenav.java PrimitiveNav.java

Compiled it following my notes at 
 /var/www/cs/htdocs/courses/spring2006/programming_workshop/lejos/
which Julie doesn't discuss ... though it is 
a mess to do so which the two of us spent a lot of time on.
Better would have been to seen her summary of that here,
particularly since it was such a PITA.
 $ export BASE=/var/www/cs/htdocs/courses/spring2006/programming_workshop/lejos
 $ export LEJOS_HOME=$BASE/lejos_2_1_0
 $ export PATH=$PATH:$LEJOS_HOME/bin
 $ export CLASSPATH=$LEJOS_HOME/classes
and tried to compile it on cs.marlboro.edu 
 $ lejosc PrimitiveNav.java 
 javac: target release 1.1 conflicts with default source release 1.5
... but failed.  Not worth pursuing giving how fragile this whole
system seems to be.

So ... instead I copied the .java's to my laptop and compiled 'em there.
Looks like only a couple of the files are in Julie's final version; 
that's not clearly documented.

 # on thirty.marlboro.edu, 
 # copied PrimitiveNav.java and PrimitiveWatcher.java
 $ cd /Users/mahoney/src/lejos_2_1_0/jims_stuff
 $ . lejos.env 
 $ cd Julie_PowersBolye
 $ lejosc PrimitiveWatcher.java
 $ lejosc PrimitiveNav.java
 $ lejos PrimitiveNav

I haven't tried to acquire Julie's robot to test further;
the in-class demo will have to suffice.

On cs.marlboro.edu, I also created the docs/ directory with
the javadocs (which Julie apparently hasn't learned about) thusly
 $ javadoc *.java -d docs
which may have used the CLASSPATH I set up above to find javax stuff; 
I'm not sure.
(Reminder: the lejos javadocs are at http://cs.marlboro.edu/\
courses/spring2006/programming_workshop/lejos/lejos_docs/index.html)