public static void main(String[] args) { NoteList n = new NoteList(); for (int i = 0; i < 10; i++) { try { n.addNote(Note.createNote("i1 " + i + " " + i + " 6." + i + " 4")); } catch (NoteParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println("before: \n\n" + n + "\n\n"); RetrogradeProcessor retro = new RetrogradeProcessor(); retro.processNotes(n); System.out.println("after: \n\n" + n + "\n\n"); }