Comments on: C# vs Java: casting objects and calling members

By: xoran_tc

xoran_tc — Wed, 23 Feb 2011 03:40:47 +0000

Sorry, this is turning into a spam fest… In class A you would also need to mark the Method() as virtual (abstract requires no code and you have code).

I know this seems like overkill. You can read up on some of the reasoning here:
http://codeword.blogspot.com/2003/12/polymorphism-c-vs-java-vs-c.html

By: xoran_tc

xoran_tc — Wed, 23 Feb 2011 03:34:48 +0000

Oops sorry, I hijacked the Java example. Here’s what I really wanted to do (using the C# example):

public class B : A
{
public override String Method()
{
return “this is B”;
}
}

By: xoran_tc

xoran_tc — Wed, 23 Feb 2011 03:33:44 +0000

No, it’s not a type issue. In C#, to override a method of the parent class requires that you specify the modifier “override”. So, class B should look like this (note the “override” before “String Method()”:

public class B extends A
{
public override String Method()
{
return “this is B”;
}
}

The reason for this difference is that the designer(s) of C# wanted polymorphism to be more explicit (I believe).