Superclasses for inline classes

[Dan Smith]

> On Feb 12, 2020, at 11:41 AM, Remi Forax <forax at univ-mlv.fr> wrote:
> 
> a garbage class like java.util.Collections (with an 's' at the end) validate all the conditions but should not have an abstract constructor.

Why not? If identity classes can extend it, and it has no state/initialization, why not inline classes too?

(In reality, this particular class has chosen to actively prevent subclassing and instantiation by declaring a private constructor; it wouldn't qualify):

public class Collections {
    // Suppresses default constructor, ensuring non-instantiability.
    private Collections() {
    }