This question already has an answer here:
Recently I'm quite oftenly using Enumerations. So I wonder...
Is there any difference between a private Enum constructor and a enum constructor withour any visibility modifier (package-private)?
The constructor for enums is implicitly private
, just like methods for interfaces and annotations are implicitly public abstract
. The default is package local for class members.
BTW enum classes are implicitly final
and nested enum classes are implicitly static
.
Older constructs tend to allow you to add implicit modifiers, but newer constructs don't allow you to say. e.g. enums are final but you can't add final
to an enum.
来源:https://stackoverflow.com/questions/18704909/java-difference-between-private-and-package-private-enum-constructor