private static String toSerializedString(ArrayList<Station> stations) {
    String serialized = "";

    for (Station s : stations) {
      String[] parameters = new String[4];
      parameters[PARAMETER_STATION_NUMBER] = s.getNumber() + "";
      parameters[PARAMETER_STATION_NAME] = s.getName();
      parameters[PARAMETER_STATION_URL] = s.getUrl();
      parameters[PARAMETER_STATION_TEMPERATURE] = s.getTemperature() + "";

      for (String parameter : parameters) serialized += parameter + SEPARATE_PARAMETERS_TAG;
      serialized += SEPARATE_STATIONS_TAG;
    }

    return serialized;
  }