Scala-Option-Null的蹊跷scala Some(null)_百度搜索scala - Why Some(null) isn't considered None? - Stack OverflowSome(null)? | The Scala Programming LanguageScala中if使用 - CSDN博客Scala中的None,Nothing,Null,Nil - CSDN博客【Scala】使用Option、Some、None,避免使用null - 简书