PPT Slide

Inheritance Hierarchies - Cautions

1. All of the behaviors defined by abstractions at higher levels of a hierarchy

and not redefined at the lower levels of the hierarchy should be applicable to

objects defined by classes at lower level of a hierarchy.

2. Inheritance hierarchies are a very general abstraction. Each implementation

of inheritance hierarchy (eg. inheritance in Java) is a particular instance of the

hierarchy abstraction as defined here.

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