What are the principle concepts of OOPS?

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What are the principle concepts of OOPS?

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There are four principle concepts upon which object oriented design and programming rest. They are:
&#8226; Abstraction
&#8226; Polymorphism 
&#8226; Inheritance
&#8226; Encapsulation 
(i.e. easily remembered as A-PIE).

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What are the principle concepts of OOPS?

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