How can I control system's volume with java?

Question

Hi, I'm trying to make a remote audio control and I need a way to set current volume by code.
After looking at java sound APIs I came up with this:
line = mixer.getLine(lineInfo);
boolean opened = line.isOpen() || line instanceof Clip;
if(!opened){
     System.out.println("Line is not open, trying to open it...");
     line.open();
     opened = true;
if(line.isControlSupported(FloatControl.Type.VOLUME)){
          FloatControl volumeCtrl = (FloatControl)line.getControl(FloatControl.Type.VOLUME);
               System.out.println("Current volume is: "+volumeCtrl.getValue());
}I tried this code with every mixer I have (althought I think it's the "SPEAKER" one...) but I always get 1.0 as current volume, no matter what.
So, I'm getting something wrong..can you help me?:(

Answer 1

Late but just to make it clear, the answer to these kind of questions is the same 999/1000 times. As soon as your question takes this form:
"how do I do SOMETHING in OPERATING SYSTEM using Java",
the answer is:
"You need to write a native library that can do it and call that using JNI or JNA from Java."
Because Java is cross-platform, it cannot do platform-specific stuff like changing the volume or whatever you want to do to control the OS. You need to use the operating system's unique API layer to do it.