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What are different properties provided by Object-oriented systems ?

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Abstract class defines an abstract concept which can not be instantiated and comparing o interface it can have some implementation while interfaces can not. Below are some
points for abstract class:- 
=>We can not create object of abstract class it can only be inherited in a below class. 
=> Normally abstract classes have base implementation and then child classes derive from the abstract class to make the class concrete.
 

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