//创建集合 实体类 PubClassRoomProject
List<PubClassRoomProject> newList =new ArrayList<>();
// java8 根据对象属性分组统计
Map<Object, List<PubClassRoomProject>> map =
newList.stream() .collect(Collectors.groupingBy(t -> t.getPubClassRoom()));
jdk 8 list分组
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