Want to send dava from java to ardruino

Good day,

I have downloaded java rxrtx and i have setup the demo program in eclipse in java that was posted on the ardruino play ground here:
http://playground.arduino.cc/Interfacing/Java

Now that demo only has a receive method, how do i add a send method?
I know i have to use output.write(): but where do i put it? and how do i call it?

Thanks

Is there really not just a simple interface for rxtx in java that has a read and a write method.
You set the com port and baud rate and then you are done?

Why the complex java code?
If any one knows of such a program or source code please could you let me know?