class?DictItem{ ????????private?String?dataType; ????????private?String?dataCode; ????????private?String?dataValue; }如何將List<DictItem>轉(zhuǎn)化為Map<String,List<String,DictItem>>按照datatype,datacode 分組這種方式得到的是Map<String, Map<String, List<DictItem>>> ????????dictMaps?=?dictItems.stream().collect(Collectors.groupingBy(DictItem::getDataType,?Collectors.groupingBy(DictItem::getDataCode)));