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map.getOrDefault().add() in Java not works 본문
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<Integer, List<Integer>> map = new HashMap<>(); if (!map.containsKey(1)) { map.put(1, new ArrayList<>()); } map.get(1).add(...
stackoverflow.com
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