- Flexibility is important.
- Objects can be extended in subclasses
- There is a specific reason why one subclass would be chosen over another—this logic forms part of the Factory
- Method.
- A client delegates responsibilities to subclasses in parallel hierarchies.
Consider using instead....
- The Abstract Factory, Prototype, or Builder patterns, which are more flexible (though also more complex).
- The Prototype pattern to store a set of objects to clone from the abstract factory.
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