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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.