viewing directoires and sub directoires

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Java

directory

file-system

Ok so this whole Java thing is a still new to me and I am trying to learn it by building myself something to list all the folders and subfolders i have in my music collection (this is a lot)

I have the following code done so far and it loops through and lists the top level repeatly about 10 times for each folder. I had it just doing it one before i changed it.

Could anyone help me correct it and have it listing all folders??

public static void main(String args[]){
   File file = new File("D:\\music");
   File[] files = file.listFiles();
   for (int fileInList = 0; fileInList < files.length; fileInList++)
   {
         if (file.isDirectory()){

            File[] subFolder = file.listFiles();
            for (int i=0; i< subFolder.length; i++) {
                FoldersOnly(new File(files, subFolder[i]));

   System.out.println(files[fileInList].toString());
   }
       }
    }
}
}

I have been using the interent and books to help me get this far but i just cant get the last bit right. The error seems to be in the FoldersOnly line of code according to Netbeans but I just cant get it to work.