1.
Map<Integer, Boolean> answerMap = new HashMap<>(); for (Answer answer : answerList) { answerMap.put(answer.getId(), answer.getAnswer()); } Map<Integer, Boolean> answerMap = new HashMap<>(); answerList.forEach((answer) -> answerMap.put(answer.getId(), answer.getAnswer()));
原文:http://www.cnblogs.com/bravolove/p/5845460.html