//List<String> 排序
Map<String, List<Entity>> map = MapUtils.newHashMap();
List<String> keys = ListUtils.newArrayList(map.keySet()).stream().sorted(Comparator.comparing(d -> d)).collect(Collectors.toList());
//List<Entity> 排序
List<Entity> list = result.sort((a, b) -> a.getCustomer().getId().compareTo(b.getCustomer().getId()));