Lecture 1 : What is an Object? 2 Rules of Smalltalk

Abstraction

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  The act of creating a superclass for several classes.
  
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  How?
  
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  Identify the shared state and /or behavior across the classes
  
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  Move shared properties to the new abstract superclass
  
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  Interpose the new abstract superclass in the class hierarchy
  
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  Benefit: code reuse, simplify maintenance, better understanding
  
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  E
  xample
  

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  Example:
  

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