1、Lamda表达式,map快速获取对象的某一个属性生成集合
List<String> elementSlugs = elementInstanceBOList.stream().map( elementInstance->elementInstance.getSlug()).collect( Collectors.toList());
2、实现将一个List的属性赋值给另一个List,只用一层循环
List<AlarmRecordDO> alarmRecordDOS = new ArrayList<>(); if (CollectionUtils.isNotEmpty(page.getContent())){ alarmRecordDOS=mapper.mapList(page.getContent(),AlarmRecordDO.class); List<AlarmStrategyPO> alarmStrategyPOS=listAllAlarmStrategy(); //将 alarmStrategyPO的oid和name构建一个map final Map<Long, String> map=alarmStrategyPOS.stream().collect(Collectors.toMap(AlarmStrategyPO::getOid, AlarmStrategyPO::getName)); alarmRecordDOS.stream().forEach(alarmRecordDO -> { alarmRecordDO.setAlarmStrategyName(map.get(alarmRecordDO.getAlarmStrategyId())); }); metadata.getPaginationParam().setTotalCount((int) page.getTotalElements()); }