I have created project for you.
Delete all created projects so far
Unzip to a real folder get NetBeans project folder
Click on file->open project
Navigate to unzipped folder and click open
The project will be shown in left pane (project explorer)
Right click on project ad click on properties
under categories(left pane), click on 'Run' to select.
In right pane, Browse to test file (TommyBillupsp3Test) as main class file
in argument box, put any text file name like a.txt
Click on ok
Right click on project and click Run to get output. output will laso be written to the filename given as argumet and this file will be created in project's root folder
Also change the class name in UML diagram :)