SantasList.java

import java.util.ArrayList;
import com.claus.Santa;
import com.world.Person;
import com.world.PersonHelper;

public class SantasList {
    private Santa mSanta;
    private ArrayList<Person> mList;

    public SantasList(Santa santa) {
        mSanta = santa;

        MakeList();

        CheckList();
        CheckList();

        FindOutWhosNaughtyAndNice();

        mSanta.isComingToTown = true;
    }

    public void MakeList() {
        mList = new ArrayList<>();
    }

    public void CheckList() {
        for (Person person : PersonHelper.GetAllThePeopleOfTheWorld()) {
            if (!mList.contains(person)) {
                mList.add(person);
            }
        }
    }

    public void FindOutWhosNaughtyAndNice() {
        for (Person person : mList) {
            person.Naughty = PersonHelper.IsNaughty(person);
            person.Nice = !PersonHelper.IsNaughty(person);
        }
    }
}