What is the difference between Abstraction and Polymorphism

Question

I seem to not understand two OOP concepts very well. Could you explain what abstraction and polymorphism are, preferably with real examples and

Answer 1

very easy.

1. Abstraction is abstraction. Class 'Student' is an abstraction of a real student.

2. Polymorphism is when one class represents another so that user won't notice. This could happen when classes implement the same interface or one class derives from another. Class 'HighSchoolStudent' is derived from class 'Student'. When class 'Teacher' calls #attendance method on the object it might not know whether this object is of 'Student' class or 'HighSchoolStudent' class.