Map<Integer, List<Entity>> groupBy = entityList.stream() .collect(Collectors.groupingBy(Entity::getGrouper));
Map<Integer, Entity> entityMap = entityList.stream() .collect(Collectors.toMap(Entity::getKey, entity -> entity));
posted on 2022-04-11 22:39 路过君 阅读(59) 评论(0) 编辑 收藏 举报