Not too sure if Java supports this, since it is system-specific.
Why don't you use the standard file browser, which automatically handles these specificities?

[EDIT] As usual, they abstracted this away...
Note: usually a search on Java is fruitful:
http://stackoverflow.com/questions/51320/find-all-drive-letters-in-java

Thank you so much!
It works!

Why don't you use the standard file browser...?

What do you mean by this?
I also use "selectFolder".
Do you mean that?

I find it not well designed, it looks old fashoned, so I just write my own.

I'd love to see JavaFX in processing, I think somebody did it once.

Greetings, Chrisir   


here is a part of my current code using "selectFolder":

1. void chooseFolder() {
2.   // select a new folder (called by the open button)
3.   File folderToStartFrom = new File( pathGlobal );
4.   println(folderToStartFrom);
5.   selectFolder("Select a Music Folder to play",
6.   "folderSelected",
7.   folderToStartFrom );
8. }
9. //
10. void folderSelected(File selection) {
11.   // this runs in another thread parallel to the main thread
12.   // and is called by chooseFolder()
13.   if (selection == null) {
14.     println("Window was closed or the user hit cancel.");
15.   }
16.   else {
17.     indexFile=0;
18.     state = stateNoSong;
19. ...............
20. .............

I integrated this in my lovely MP3-Player now


https://forum.processing.org/topic/lovely-mp3-player

" I find it not well designed, it looks old fashoned, so I just write my own."
That's fine, as it can be consistent with the remainder of your interface, etc.
The advantage of the standard one is a better integration with the system, and, well, it is less work.
But making your own is fun too (and educative!).