Update CollatzJava

You cannot write a class without having comments saying what the class does.  Do you know javadoc?  If not, lets learn it.

You should put your class into a package rather than at the top level.  For example, org.basilthebeagles.tool.  That means you will have to 'git move' the file from the top level here to a subdirectory org/basilthebeagles/tool.  Your IDE should be able to help you here.  Use the 'move' or 'rename' function.

Lets not use the swing stuff and learn how to take an argument on the command-line instead.  We'll start out easy then try a library to help parse the command line input.  We will output on the command line too.

For code 'style', what are you using?  Just arbitrary?  Lets adopt a convention. If you know none, I can help here.

Also, folks usually limit line length to 80 or 100 chars or so.  You can get your IDE to help you do this.  Usually they can draw a line down the right side at 100 characters width.