10.11 (Optional) GUI and Graphics Case Study: Drawing with Polymorphism
You may have noticed in the drawing program created in GUI and Graphics Case Study Exercise 8.1 (and modified in GUI and Graphics Case Study Exercise 9.1) that shape classes have many similarities. Using inheritance, we can “factor out” the common features from all three classes and place them in a single shape superclass. Then, using variables of the superclass type, we can manipulate shape objects polymorphically. Removing the redundant code will result in a smaller, more flexible program that’s easier to maintain.
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