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Stream is great example of polymorphism. Stream represents a "sequence of bytes that can be read or written". But this sequence can come from file, memory, or many kinds of network connections. … Some would say Stream is wrong example of polymorphism, because it defines many "features" that it's implementors don't support, like network stream only allowing reading or writing, but not both at the …

I'm personally perfectly fine using downcasting. Simply because it is same as language-aided visitor pattern. It becomes even better if you create HasRadius interface/abstract class, that allows you t …

The point of interfaces is to allow piece of code to express what API it works with. And then allow this API to be implemented by multiple classes. In your case, instead of AforB or AforC, make it Bne …

The virtual method called always depends on type of concrete instance in memory and never on how this instance is accessed or type of variable the instance is accessed from. The type of variable just …

Best fit would probably be Visitor pattern. And if you need to do things like this, then you should re-think your object model, because having behavior, that works only on specific type should be par …