public class PersonenListe {

    private Person person;
    private PersonenListe next;

    public PersonenListe(Person person) {
        this.person = person;
    }

    protected PersonenListe(Person person, PersonenListe next) {
        this.person = person;
        this.next = next;
    }

    public Person getPerson() {
        return person;
    }

    public PersonenListe getNext() {
        return next;
    }

    /**
     * A new list whose first element represents the given person and the rest
     * resembles this list.
     */
    public PersonenListe add(Person person) {
        return new PersonenListe(person, this);
    }

    @Override
    public String toString() {
        if (this.next == null)
            return person.toString();
        else
            return person + "," + next.toString();
    }

}