Avoiding RTTI In Java

Posted by destructo_gold on Stack Overflow See other posts from Stack Overflow or by destructo_gold
Published on 2010-03-26T06:29:14Z Indexed on 2010/03/26 6:33 UTC
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rtti

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oop

Hi,

If I have a superclass, say Animal,

and two subclasses: Zebra and Giraffe,

If I decide to define a Vector of Animals:

Vector <Animal> animals = new Vector();

and I want to say: You can add Giraffes, but you must own at least one Zebra first.

What is the best way to do this without using RTTI? (instanceof)

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