jdk 8 list分组

//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()));