List实体去重

public static ArrayList<Room> removeDuplicate(List<Room> room) {
		 Set<Room> set = new TreeSet<Room>(new Comparator<Room>() {
			 @Override
			 public int compare(Room o1, Room o2) {
				 //字符串,则按照asicc码升序排列
				 return o1.getId().compareTo(o2.getId());
			 }
		 });
		 set.addAll(room);
		 return new ArrayList<Room>(set);
	 }