코드굽는 타자기

https://stackoverflow.com/questions/64095419/map-getordefault-add-in-java-not-works map.getOrDefault().add() in Java not works The traditional code works well like below: Map map = new HashMap(); if (!map.containsKey(1)) { map.put(1, new ArrayList()); } map.get(1).add(... stackoverflow.com

https://stackoverflow.com/questions/27454025/unable-to-obtain-localdatetime-from-temporalaccessor-when-parsing-localdatetime Unable to obtain LocalDateTime from TemporalAccessor when parsing LocalDateTime (Java 8) I am simply trying to convert a date string into a DateTime object in Java 8. Upon running the following lines: DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd"); L..

https://velog.io/@ino5/%EC%9E%90%EB%B0%94-%EC%8B%9C%ED%94%84%ED%8A%B8-%EC%97%B0%EC%82%B0-132-1 자바에서 레프트 시프트 연산 주의할 점 (-1