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why to create interfaces in real applications suppose you are creating an employee management system project and you have two classes permanent employee and contractual employee now you should have one interface I employ which will have only Declaration of these two methods assign email and assign manager now our basic question is why we are declaring these methods here why not directly Implement them in the derived class we are declaring them to maintain consistency so that in future if some other developer create any other type of employee class like temporary employee then he must implement this I employ interface otherwise that developer will create his own methods like set email or set manager in temporary employee class which will create inconsistency then write so interfaces Define contracts for your classes here are the benefits interface will help in defining the contracts of the system then unit testing is easy in application having interfaces then interfaces are good for imp
