The jar is a java program which actually contains two Main classes. One is WordCountJ; the other is WordCountMR.
This is the folder for source code.
This folder contians testing files.
The program result will be storaged in this folder.
This file is an ant configuration file.
$ ant
$ java -jar dist/wc.jar
$ bin/hadoop jar wc.jar edu.iit.cs.cs553.WordCountMR input output