List<String> noteIdList = list.stream().map(Note::getId).collect(Collectors.toList());
Set<String> userIdSet = noteMap.values().stream().map(Note::getUser_id).collect(Collectors.toSet());
List<String> noteIdList = list.stream().map(Note::getId).collect(Collectors.toList());
Set<String> userIdSet = noteMap.values().stream().map(Note::getUser_id).collect(Collectors.toSet());
本文标题：Java 8 lamda 表达式
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