Java to C#: Extends in Generic

Question

I am trying to convert this Java (Android) code to c# (MonoDroid) but I don\'t understand the

public class Ball         


        

Answer 1

This means that the parametrised type Item has to be a subclass of OverlayItem

Semantically, this implies that it makes to no sense to instantiate BalloonOverlayView with a parameterised type if it does not extend OverlayItem