What is a singleton model?

Example. The Singleton pattern ensures that a class has only one instance and provides a global point of access to that instance . It is named after the singleton set, which is defined to be a set containing one element. The office of the President of the United States is a Singleton.

It is used where only a single instance of a class is required to control the action throughout the execution . A singleton class shouldn’t have multiple instances in any case and at any cost. Singleton classes are used for logging, driver objects, caching and thread pool, database connections.

A Singleton is a software design pattern to restrict the instantiation of a class to a single instance .