public static void main(String[] args) { AnswerList answerList = new AnswerList(); answerList.setAnswers(new ArrayList<Answer>()); System.out.println( new JSONSerializer() .exclude("*.class") .serialize(Arrays.asList(new AnswerList[] {answerList, answerList}))); service = new Service(); sc = new Scanner(System.in); while (true) { System.out.println("1. dodaj tabele\n2. odpowiedz na badanie\n3. szukaj"); switch (sc.nextInt()) { case 1: createNewResearch(); break; case 2: answer(); break; case 3: search(); default: break; } } }