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PODesign Patterns: Abstract Factory vs Factory Method
 

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    <p><em>Note: Questions are at the end of the post.</em></p> <p>I have read the other stackoverflow threads regarding <strong>Abstract Factory vs Factory Method</strong>. I understand the intent of each pattern. However, I am not clear on the definition.</p> <blockquote> <p>Factory Method defines an interface for creating an object, but lets subclasses decide which of those to instantiate. A factory method lets classes defer instantiation to subclasses.</p> <p>By contrast, an Abstract Factory provides an interface for creating families of related or dependent objects without specifying their concrete classes.</p> </blockquote> <p>-<a href="https://stackoverflow.com/questions/1001767/design-patterns-factory-vs-abstract-factory">John Feminella</a></p> <p>The <strong>Abstract Factory</strong> looks very similar to the <strong>Factory Method</strong>. I have drawn a few UML classes to illustrate my point. </p> <p>Note: </p> <ul> <li>The diagram are from <em>www.yuml.com</em> so they are not perfectly oriented. But its a free service :).</li> <li>The diagrams may not be perfect. I am still learning the <strong>GoF</strong> design patterns.</li> </ul> <p><strong>Factory Method:</strong></p> <p><img src="https://i.stack.imgur.com/69jJo.jpg" alt="Factory Method"></p> <p><strong>Abstract Factory (only 1 member):</strong></p> <p><img src="https://i.stack.imgur.com/BQOzX.jpg7866ef51" alt="Abstract Factory (only 1 member)"></p> <p><strong>Abstract Factory (more members):</strong></p> <p><img src="https://i.stack.imgur.com/yMP7a.jpg" alt="alt text"></p> <p><strong>Questions:</strong></p> <ol> <li>If the <strong>Abstract Factory</strong> has only one creator and one product, is it still the <strong>Abstract Factory</strong> pattern? <em>(an interface for creating familes)</em></li> <li>Can the <strong>Factory Method</strong> concrete creator be created from an Interface or does it have to be from a class? <em>(classes defer instantiations to subclasses)</em></li> <li>If the Abstract Factory can have only one creator and one product, is the only difference between the <strong>Abstract Factory</strong> and the <strong>Factory Method</strong> that the creator for the former is an Interface and the creator for the latter is a Class?</li> </ol>
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    1. CONote: When I refer to Interface I was thinking more in the terms of a Java Interface (abstract class with abstract virtual methods). Feel free to clarify if a difference exists between the Abstract Factory and the Factory Method in different languages.
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    2. COA basic difference here: http://stackoverflow.com/questions/1001767, though not as specific as you're asking..
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