simple inheritance question

[relient]

Hi, I have three classes: Animal, Dog and Cat. Dog inherits from Animal
and Cat inherits from Dog. My question is: is Cat now also a Animal
even though it didn't inherit directly from Animal?

 

[Aboulfazl Hadi]

Hi
Ya, the derived class is type of all its base classes and inherits all
of state and behaivour of all of its parents.

A.Hadi

 

[Nick Hounsome]

Hi, I have three classes: Animal, Dog and Cat. Dog inherits from Animal
and Cat inherits from Dog. My question is: is Cat now also a Animal
even though it didn't inherit directly from Animal?

Who knows? Since you can only make a cat inherit from a dog by some rather
extreme genetic engineering it's difficult to say.

If, on the other hand, Labrador inherited from Dog then it would be an
Animal.

 

[Jeff Louie]

Yes and cat is now also a dog!

Regards,
Jeff

 

[Mark Harris]

I forwarded this onto the developers group here, this is one of the
repsonses i got back:

Fur what it's worth...

If I inherited a cat, I would exchange it for a dog because I prefer
dogs.

 

[Nick Hounsome]

I forwarded this onto the developers group here, this is one of the
repsonses i got back:

Fur what it's worth...

aaaaagh that's an awful pun.

 

[Joanna Carter [TeamB]]

"relient" <[email protected]> a écrit dans le message de (e-mail address removed)...

| Hi, I have three classes: Animal, Dog and Cat. Dog inherits from Animal
| and Cat inherits from Dog. My question is: is Cat now also a Animal
| even though it didn't inherit directly from Animal?

Inheritance implies an "is a" relationship. By inheriting Dog from Animal,
you are saying that a Dog "is" an Animal. Inheriting Cat from Dog means that
a Cat "is" a Dog, which "is" also an Animal.

Apart from the fact that a Cat isn't really a Dog shouldn't spoil the
illusion )

Seriously though, You would correctly inherit both Cat and Dog from Animal
and then you could inherit from Dog to give you different breeds like
Alsatian, Spaniel, etc.

Joanna