pojo集合转map

Map
 
   remarkMap = remarkList.stream().
                    collect(Collectors.toMap(
                            FriendshipRemark::getFrAccountId,
                            Function.identity(),
                            (key1, key2) -> key2, LinkedHashMap::new));

            accountList.stream().forEach(n -> {
                //获取备注名并放入nick中
                n.setNick(remarkMap.get(n.getId()) == null ? "" : remarkMap.get(n.getId()).getRemarkName());
            });