How about :

-- start psuedo code --
// some stuff...

JFileChooser jfc = new JFileChooser();
jfc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

// get selected directory form jfc, make sure cancel was not pressed...

File myDirectory = new File(selectedFile);
if (myDirectory.isDirectory) {
       File subFiles[] = myDirectory.listFiles();      
       /* you now have a list of files AND sub-directories in the subFiles  
        * array you can check each one in turn by calling the isFile() method
        * for each File object. Alternatively, use the listFiles method with
        * a custom FileFilter object.
        */
}
-- end psuedo code --
I think that should give you an example of ONE possible way to accomplish
this.

HTH,
Carl.

java.io.File.list() or..
java.io.File.listFiles()

[ Where the 'file' - is a directory ]

JFileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

Use File.list of the File object returned
by the JFileChooser

HTH