No they're not, they are not wrapping an object instance, they are providing ad-hoc functionality only. The generic parameters provided to BubbleSort are constraining the arguments and allowing access to the ad-hoc functionality, something that can't be done with inheritance unless you own the type.

This is exactly how traits, implicits, type-classes, class-instances, and concepts work in other languages like Scala, Haskell, etc.