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1) A class is called an abstract class if it is marked with an abstract keyword. 2)The reason for which abstract class came into existence is that it provides a default functionality to its subclasses ...

The Singleton pattern ensures that a class has only a fixed number of instances and provides a global point of access to them. The Abstract Factory pattern provides an interface for creating families ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American Hashtags have become a standard in ...