You can solve  the problem using File class from java.io package.
It works with all kinds of paths. It has methods to find  out if you
are dealing with a file or directory. getAbsolutePath(path) gets
the absolute path, current path  using getPath() and list() gets the
directory listing.

I'll try io package. I assume that java  has some kinds of package deal
with path  and directory sturcture, but I'm kinda new to java..so..
Anyway, thank you so much for your prompt response.

you can access the drive  letters in this way:

File[] roots = File.listRoots();