java8之lamda

Posted 2021-02-28 关键步就几步

1、Java8之list<entity>获取实体的某一字段
示例  

List<String> titles = titleList.stream().map(e -> e.get(ConstantUtil.TITLE)).collect(Collectors.toList());

优化: 

List<String> fieldList = mountTableVoList.stream().map(ResMountTable::getFieldName).collect(Collectors.toList());

2、过滤转list  

List<RiseLimitedSumDataDTO> todayList=todayListOrigin.stream().filter(r->!"a".equals(r.getRiseStatus())).collect(Collectors.toList());

3、转map

Map<String, String> beforeMap = beforelist.stream().collect(Collectors.toMap(RiseLimitedSumDataDTO::getCode, RiseLimitedSumDataDTO::getName));