I'm using generics like this:
public class MyList<T>. Is there any way to ensure that the class represented by T implements a certain static method?
No, even without generics there is never a way to ensure a class implements a static method.
You can, however, create a generic static method.
As an alternative, consider whether the static methods of your class belongs in some sort of associated class like a builder:
It may be better to move the static to a separate class as a non-static method:
This means that you can dictate clients of your generic class can now be required to provide it: