Question:What are the abstract class and interface? 

Answer Ans: Abstract class: Abstract classes are the class where one or more methods are abstract but not necessarily all method has to be abstract. Abstract methods are the methods, which are declare in its class but not define. The definition of those methods must be in its extending class.
Interface: Interfaces are one type of class where all the methods are abstract. That means all the methods only declared but no defined. All the methods must be defined by its implemented class.

 

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