other than the problems with fly() and quack(), the Duck class is working well and there are no other parts of it that appear to vary or change frequently
- 1. Intro to Design Patterns: Welcome to Design Patterns
- from Head First Design Patterns
- Publisher: O'Reilly Media, Inc.
- Released: October 2004
isn’t the display also a varying part since it’s implementation is different in each subclass or is it a constant part because it’ll be there in all sub-classes however that way …..
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