Add some comments, add/remove some XXX, use System.nanoTime() to measure elapsed time (as suggested by the Java API Docs) and print the elapsed time in milliseconds.
Add some comments, add/remove some XXX, use System.nanoTime() to measure elapsed
time (as suggested by the Java API Docs) and print the elapsed time in
milliseconds.

jdebrabant/parallel_arules,jdebrabant/parallel_arules,jdebrabant/parallel_arules,jdebrabant/parallel_arules