A singleton class in Java is defined as that class that has only one object, i.e. only one instance of the class. The restricting of the instance to only one per class helps in coding particular programs that require only one instance of the class. The only instance of a singleton class is given a global point of access.

Singleton class is one of the important design patterns in Java programming. Singleton classes help in limiting resources and optimising them; it is used a lot in database connections or sockets. There are implementation syntaxes for singleton class, and a good developer must know about it. Let us see the implementation of the singleton class in Java.

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