시그마 삽질==six 시그마

Stream.of(day1, day2) .flatMap(x -> x.stream()) .map(v->new SeminarSection(v.getDayOrder(),v.getDay())) .distinct() .sorted(Comparator.comparing((SeminarSection ::getDayOrder))) .collect(Collectors.toList()); .sorted(Comparator.comparing((SeminarSection s)->s.getDayOrder))) : 오름차순 .sorted(Comparator.comparing((SeminarSection ::getDayOrder))) : 오름차순 .sorted(Comparator.comparing((SeminarSection ::..