I'm the author of
JConfig, and sometimes it takes a while or a couple tries for me to answer questions.
As for the questions you sent via email, JConfig comes with the full source, and the DiskBrowser application in the com.tolstoy.testjc package illustrates how to get file and drive information.
For a concise rundown, see the
JConfig overview : "Get information on drives, directories, and files", etc.