java8 转map key相同 值逗号隔开

if(CollUtil.isNotEmpty(tpartDingOrgList)){
orgMap = tpartDingOrgList.stream().collect(Collectors.toMap(arr -> arr.getOrganizationUuid(),arr ->CollUtil.newArrayList(arr.getBelongOuUuid()), (List<String> oldList, List<String> newList) -> {
        oldList.addAll(newList);
return oldList;
}));
}
List<String> deptNameList = finalOrgMap.get(deptId);
String deptName = Convert.toStr(deptNameList,",");

Map<Long, String> buildSkyscraperMap = new HashMap<>();
if(CollUtil.isNotEmpty(buildSkyscraperList)){
buildSkyscraperMap = buildSkyscraperList.stream().collect(Collectors.toMap(BuildSkyscraper::getId, s -> Optional.ofNullable(s.getBuildName()).orElse("无"),(a,b)->a));
}



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