"Overriding" instance variables in subtype: Possible risks?

Posted by sebastiangeiger on Stack Overflow See other posts from Stack Overflow or by sebastiangeiger
Published on 2010-05-19T10:23:23Z Indexed on 2010/05/19 10:30 UTC
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Say I had a class SuperClass and two subclasses SubClassA and SubClassB that inherit from SuperClass.

 abstract class SuperClass{
   ...
   List someList;
   ...
 }

 class SubClassA extends SuperClass{
   ...
   List<String> someList;
   ...
 }

 class SubClassB extends SuperClass{
   ...
   List<Integer> someList;
   ...
 }

That way it is convenient because I can get someList.size() in Superclass and have Typesafety in the Subclasses. The problem is that it does not "feel" right, can you think of potential hazards this apporach has that I am not aware of?

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