Instructors' Guide

Introduction Terminology Expressions Control Objects Inheritance Technology Summary

Inheritance

 Each class in the Smalltalk library is (ultimately) a subclass of the class Object. See slide sm-inheritance.

Inheritance

 
    Object
      Magnitude
         ArithmeticValue
            Number
               Integer
slide: Smalltalk -- inheritance
 Smalltalk supports only single inheritance. Above, the ancestor classes of the class Integer are depicted as a branch of the inheritance tree.