[dragonwriter]

> From OO perspective, there really isn't any difference between Java and C#

I'd say that properties, reified generics, and extension methods are all highly relevant to statically-typed, class-based OOP, and significant C# vs Java differences.

[Danao]

Are these features (properties, reified generics, extension methods etc.) implemented in C# or in Java?

[dragonwriter]

All three in C#, not Java (Java has properties, but they aren't the same kind of thing as C# properties.)