public static void main(String[] args) {

    List<Person> people = PersonHelper.getPeople();

    oldSchool(people);

    java8(people);
  }
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
    getActivity().setTitle(R.string.app_name);

    mPersonList = PersonHelper.get(getActivity()).getPersonList();

    PersonAdapter adapter = new PersonAdapter(mPersonList);
    setListAdapter(adapter);
    setRetainInstance(true);
  }
 @Override
 public void onPause() {
   super.onPause();
   PersonHelper.get(getActivity()).savePersonList();
 }