This tutorial  does a comparative analysis  between structured (procedural) programming and Object Oriented Programming. It also explains the basic principles of Inheritance and Polymorphism in Java (OOPs).

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Inheritance & Ploymorphism points to note:

Inheritance: In simple words , Inheritance is way to define new a class , using classes which have already been defined.

Ploymorphism: Is the ability of methods to behave differently , based on the object calling it.