Set Computer Volume

Question

I want to make a java program that

1. Reads a line from a file (ex.File text is : "Hello")
2. if the Line = "Hello" then
3. get computer volume if computer volume is > 1 then Volume=volume / 2

I don't know how do the volume part, of this program. I have looked online for the past hour and I can't seem to get an idea on how to do this, or if it is even possible.

I forgot to add (I'm using windows 7)

Answer 1

I have written an utility class for controlling volume which is used like that:

Audio.setMasterOutputVolume(0.5f);

Source code is here: https://github.com/Kunagi/ilarkesto/blob/master/src/main/java/ilarkesto/media/Audio.java

You can copy and use the code.