哪个可见性修饰符的可见性较低：受保护的还是内部的？

Question

Which visibility modifier is more permissive: Protected or Internal?

 internal var num = 18
        protected set   // throws an error at 'protected' showing: Setter visibility must be the same or less permissive than property visibility

And I try this also:

 protected var num = 18
        internal set   // throws an error at 'internal' showing: Setter visibility must be the same or less permissive than property visibility

Answer 1

protected means that the member has the same visibility as one marked as private, but that it is also visible in subclasses.

internal means that any client inside this module who sees the declaring class sees its internal members.

Answer 2

They aren't comparable; neither is more permissive than the other.

A subclass in another module will see protected members, but not internal .

An unrelated class in the same module will see internal members, but not protected .