How do I detect if Java is running in a GUI environment or not?

I have a program that I would like to run both from the command line as well as via a gui depending on the environment it is being executed in. How do I detect if java was run from a terminal of some sort, or via a gui?

Worth 500 points.

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sciuriwareConnect With a Mentor Commented:
I think the only way to detect is via the commandline:
if the program is run from the command line, you can give various arguments, like:

java -jar Program.jar argument1 argument2 ....

if the program is run from another program or from a double click, there is usually no argument on the command line.

This is the way almost all Microsoft and Linux utilities do it.
It's hard to find, but programs like word, excel and powerpoint read their (sometimes) undocumented command line switches,
while clicking an icon will only give a subject filename or drag-and-drop a filename.

The easiest way is to write this info into a file and then read this file to detect whether the applciation runs from a gui or from command line. Or have a socket that listens to a port and then connect to this port and read the proper information.
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