@Override
	public IEmailKontakt next(IEmailKontakt emailKontakt)
			throws NoNextEmailKontaktFoundException {
		EmailKontaktList emailContacts = readContacts();
		if (emailContacts.getContactList().size() == 0) {
			throw new NoNextEmailKontaktFoundException("Kein Kontakt gefunden!");
		} else {
			EmailKontakt ek = new EmailKontakt();
			for (EmailKontakt contact : emailContacts.getContactList()) {
				if (contact.getId() > emailKontakt.getId()
						&& (ek.getId() < emailKontakt.getId()))
					ek = contact;
			}
			if (ek.getId() == -1) {
				throw new NoNextEmailKontaktFoundException(
						"Kein Kontakt gefunden!");
			}
			return ek;
		}
	}