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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.
Singleton (mathematics) In mathematics, a singleton, also known as a unit set, is a set with exactly one element. For example, the set {0} is a singleton. The term is also used for a 1-tuple (a sequence with one member). Contents. 1 Properties. 2 In category theory. 3 Definition by indicator functions.