What is singleton and how to create singleton class and benefits ?

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Accepted Answer

Singleton is a design pattern that restricts the instantiation of a class to one object.

To create a singleton class, make the constructor private, create a static method to get the instance of the class, and create a private static variable to hold the instance.
Benefits of singleton include ensuring only one instance of the class exists, providing a global point of access to the instance, and reducing the number of objects created in the system.
Example: java.lang.Runtime is a singleton class that provides access to the runtime environment of the system.
Example: Database connection pool is a singleton class that manages the connections to the database.
Example: Logger class is a singleton class that provides logging functionality in the application.

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