public static boolean addComboData(String aCombo) {
        File f = new File(FILE_NAME);
        if (!f.exists()) {
            try {
                if (!f.createNewFile()) {
                    return false;
                }
            } catch (IOException ex) {
                Logger.getLogger(ComboElemPersistence.class.getName()).log(Level.SEVERE, null, ex);
                return false;
            }
        }
        
        try (DataOutputStream dos = new DataOutputStream(new FileOutputStream(f, true))) {
            dos.writeUTF(aCombo);
        } catch (FileNotFoundException ex) {
            Logger.getLogger(ComboElemPersistence.class.getName()).log(Level.SEVERE, "File Not Found.", ex);
            return false;
        } catch (IOException ex) {
            Logger.getLogger(ComboElemPersistence.class.getName()).log(Level.SEVERE, "IO Error.", ex);
            return false;
        }
        return true;
    }