如何在java中从系统中运行jar文件名

I have a jar named helloDemo. I have double clicked on the jar file to run, assume it is running now. Now in another program I want to get all the jar file names and print them which are currently running or active in my system (windows7). Is there any way to do it ? I have goggled for it but no luck. Can anybody please help me on this ?. I have double cli