list<E>泛型的问题

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    @Transactionalpublic int addQuestions(Map<String, Object> map, List<Integer> njsIds) {        QuestionsNjs questionsNjs = new QuestionsNjs();Questions q = new Questions();try {BeanUtils.copyProperties(q, map);} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}questionsDao.insert(q);int userId = q.getUserId();int questionId = q.getId();questionsNjs.setQuestionId(questionId);questionsNjs.setStateForNjs(StateConstants.QuestionStateForNjs.PENDING.v());for (Integer i : njsIds) {questionsNjs.setNjsId(i);//问题农技师关联表新增记录questionsNjsDao.insert(questionsNjs);//给每个农技师一条消息addOneMessage(StateConstants.MessageType.QAMSG.v(),"tag",userId);}return 0;}

这行报错for (Integer i : njsIds)  String不能转成Integer

这是因为第一行的 List<Integer> njsIds) 不行，是个编译时的泛型，发现不了，运行时就不会报错，会在下面报错

0 0