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inheritance

SenthilNathan CAlagan
Greenhorn

Joined: Jun 21, 2001
Posts: 4
Sub class reference can be assigned to super class reference.
But super class reference cannot be assigned to sub class reference(without explicit casting).Why it is so?
Can anyone explain me in detail?
Thanks,
Senthil
Marilyn de Queiroz
Sheriff

Joined: Jul 22, 2000
Posts: 9052
    
  12
The Subclass object ALWAYS is a Superclass object by definition. However, the reverse is not true.
For example, Dog "is a" Animal, but Animal is NOT always a Dog.


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subject: inheritance