関連ワード:  java final or effectively final    java lambda final or effectively final    java declaration final or effectively final variable expected    java must be final or effectively final    java final vs effectively final    java variable must be final or effectively final    java local variable must be final or effectively final    java enclosing scope must be final or effectively final    java variable used in lambda should be final or effectively final    defined in an enclosing scope must be final or effectively final java