@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		QuizCatalogus other = (QuizCatalogus) obj;
		if (id != other.id)
			return false;
		if (quizzen == null) {
			if (other.quizzen != null)
				return false;
		} else if (!quizzen.equals(other.quizzen))
			return false;
		return true;
	}