What is a singleton class in Java? And How to implement a singleton class?

Assalam O Alaikum !!!
Singleton classes are those classes, whose objects are created only once. And with only that object the class members can be accessed.
Understand this with the help of an example-:
Consider the water jug in the office and if every employee wants that water then they will not create a new water jug for drinking water. They will use the existing one with their own reference as a glass.

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