> If I have a fruit which is an apple or a banana, I can't pass that to a method expecting an apple or banana. It can only be passed as a fruit.
You can by overriding the method on apple or banana. If your method is on some other object, then yes, you cannot do this unless your programming language supports multiple dispatch.
You can by overriding the method on apple or banana. If your method is on some other object, then yes, you cannot do this unless your programming language supports multiple dispatch.