What is Singleton Pattern in Java - How to achieve this?

In this video, I have explained What is Singleton Pattern in Java - How to achieve this?
The Singleton pattern in Java is a design pattern that restricts the instantiation of a class to one "single" instance. This is useful when exactly one object is needed to coordinate actions across the system. The Singleton pattern ensures that a class has only one instance and provides a global point of access to that instance.
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