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-We are now going to talk about the extract class refactoring. When a
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-softer system evolves, we might end up with classes that really do the
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-work of more than one class because we keep adding functionality to
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-the class. Therefore also they're too
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-big, too complicated. In particular, we might
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-end up with a class that is doing the work of two
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-classes. Typical examples are classes with many methods and quite a lot of
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-data, quite a lot of fields. In this case, it's normally good idea
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-to split the class into two, so what you will do, you will
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-create a new class and move there the relevant fields and methods from
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-the original class. So as to have two classes, each one implementing a
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-piece of the functionality. Let's look at an example. In this case we're
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-going to use a UML like representation for the class. We have this class Person
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-that ends up representing also a phone number. And imagine that we add
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-up these pieces, you know, a little bit at the time so we end
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-up with something that really is doing the job of the person and
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-of the phone number. So what we can do, we can actually do exactly
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-what we described here. We split this class
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-into a Person class, and the Phone Number class.
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-And then we establish a use relation, so we
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-have a reference of the phone number class into
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-this class. And by separating the telephone number behavior
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-into its own class, I once more improved the
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-structure of the code, because now I have classes
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-that are more cohesive, and do exactly one thing.