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Static Class: A class that only contains static components and no instance components is referred to as a static class. Singleton Class: It is a class which does not allow you to create multiple instances.
Figure 2. Singleton pattern physical model from design patterns. What we see is a simple class diagram showing that there is a private static property of a singleton object as well as public method Instance() that returns this same property. This is really the core of what makes a singleton.