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Suppose, for example, that you define the Food class, with a setter
and getter for the fCalories instance variable. Note that in these
definitions, Food is a subclass of Model, rather than of
Object, and that fCalories: sends a changed: message:
Food class definition Model subclass: #Food instanceVariableNames: 'food fCalories cCalories pCalories' classVariableNames: '' poolDictionaries: '' category: 'Experiment' Food method definition • instance fCalories ^ fCalories Food method definition • instance fCalories: aNumber fCalories := aNumber. self changed: #fCalories