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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.
Instance method requires an object of its class to be created before it can be called while static method doesn't require object creation. Using static method of another classes. If you wish to call static method of another class then you have to write class name while calling static method as shown in example below. Here we are using min and max methods of Math class, min returns minimum of two integers and max returns maximum of two integers.