With the ability to add static methods and default implementations to an interface, what is now the practical difference between that and an abstract class?
Also, an abstract class can have a constructor (and instance initializers, and initialization expressions for its fields), which an interface can't. That means an abstract class can do work when it is created.
Although it's probably a good idea not to do too much work - a factory method would be better for that.
Interfaces with the addition of default methods, in contrast to abstract classes, provide the inheritance of behaviour (but not state) from multiple sources.
