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why to use factory?

 
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Hi ranchers, what's the point in using calling like this?

instance = MyFactory.getNewInstance();
 
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There are some classes that are defined as abstract, and the only way you can
obtain an instance of the class is to use a factory method.
 
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Factory is used when the implementation of the class is unknown until run time. You usually have an interface, then multiple classes that implement the interface. Here is a practical example I remember from school.Here is the factory code.
Now in you application, you can determine what kind of sort utility you want to use at run time...
 
Pavel Kubal
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Well if I understood you correctly. Factory is used for instance when an instance is created via relfection?
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