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When you need a Class to have only one instance and you want to access from anywhere you can use singleton pattern. Let me explain a scenar...
AKA wrapper Use when an (external) component is not compatible with the current system Convert the interface of a class into another inte...
Collections contain objects of different types and in those cases some operations have to be performed on all the collection elements witho...
•Define an object that encapsulates how a set of objects interact •Promotes loose coupling by keeping objects from referring to each other ...
Also Known as Dependents, Publish-Subscribe Use when there is one to many relationship between objects and if one object is modified, its...