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Now that we've discussed how to choose a pattern. Imagine that
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you have to write a class that can have only one
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instance. So to satisfy this requirement, I would like for you
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to pick one of the design patterns that we discussed in
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this lesson, and write the code here that satisfies that requirement.
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And when you write the code, please make sure that your
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class has only one method, without counting possible constructors, and that
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the class is called Singleton. And write your class right here.
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