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Static Class: A class that only contains static components and no instance components is referred to as a static class. Singleton Class: It is a class which does not allow you to create multiple instances.
1 static: It means your method could be accessed without create instance of the respective class, using ClassName.main(). 2  void: It means your public and static method won't never return a value. The method is only execute.  main: The name of the method.