Find all drive letters in Java

Question

For a project I'm working on. I need to look for an executable on the filesystem. For UNIX derivatives, I assume the user has the file in the mighty $PATH variable, but there is no such thing on Windows.

I can safely assume the file is at most 2 levels deep into the filesystem, but I don't know on what drive it will be. I have to try all drives, but I can't figure out how to list all available drives (which have a letter assigned to it).

Any help?

EDIT: I know there is a %PATH% variable, but it is not as integrated as in UNIX systems. For instance, the application I'm looking for is OpenOffice. Such software would not be in %PATH%, typically.

Answer 1

http://docs.oracle.com/javase/7/docs/api/java/io/File.html#listRoots()

File[] roots = File.listRoots();
for(int i = 0; i < roots.length ; i++)
    System.out.println("Root["+i+"]:" + roots[i]);

google: list drives java, first hit:-)

Answer 2

Looking "everywhere" can be very messy.

Look at a CD-rom drive, and it spins up. That can be very noisy.

Look at a network drive, and it may be very slow. Maybe the server is down, and you may need to wait for minutes until it times out.

Maybe (for Windows-machines) you should just look in the start-menu. If nothing there points at OOo, it's probably not installed. If it is, the user is probably an advanced user, that will have no problems pointing out the location manually.