What are the use of singlet classes in the design (Can contain only one instance)?
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2 answers
Singleton is a copy of a class that can be only one in the whole system. Suppose the class UserService, with which will be made a request to the server for authorization / authentication. There is no need to create an instance of the UserService class each time. This class will be described as a singleton and there will be only one instance in the system (when you try to create a new instance, the result of the first creation will be returned, that is, the first and only instance).
Egor Kulik Egor Kulik
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The answer to your question is in its wording.
Singlet classes (or, alternatively, the Singleton pattern) are used in cases when it is necessary to provide a single “access point” to certain data or functions of the program.
Streletz streletz
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