UT Dallas CS 4337 - Chapter15 Class3 Inheritance & Polymorphism (57 pages)

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Chapter15 Class3 Inheritance & Polymorphism



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Chapter15 Class3 Inheritance & Polymorphism

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Pages:
57
School:
University of Texas at Dallas
Course:
Cs 4337 - Organization of Programming Languages

Unformatted text preview:

Chapter 15 Inheritance Polymorphism and Virtual Functions Copyright 2012 Pearson Education Inc 15 1 What Is Inheritance Copyright 2012 Pearson Education Inc What Is Inheritance Provides a way to create a new class from an existing class The new class is a specialized version of the existing class Copyright 2012 Pearson Education Inc Example Insects Copyright 2012 Pearson Education Inc The is a Relationship Inheritance establishes an is a relationship between classes A poodle is a dog A car is a vehicle A flower is a plant A football player is an athlete Copyright 2012 Pearson Education Inc Inheritance Terminology and Notation Base class or parent inherited from Derived class or child inherits from the base class Notation class Student base class class UnderGrad public student derived class Copyright 2012 Pearson Education Inc Back to the is a Relationship An object of a derived class is a n object of the base class Example an UnderGrad is a Student a Mammal is an Animal A derived object has all of the characteristics of the base class Copyright 2012 Pearson Education Inc What Does a Child Have An object of the derived class has all members defined in child class all members declared in parent class An object of the derived class can use all public members defined in child class all public members defined in parent class See GradeActivity Version 1 Copyright 2012 Pearson Education Inc 15 2 Protected Members and Class Access Copyright 2012 Pearson Education Inc Protected Members and Class Access protected member access specification like private but accessible by functions in a derived class inaccessible to the rest of program Class access specification determines how private protected and public members of base class are inherited by the derived class Copyright 2012 Pearson Education Inc Class Access Specifiers 1 public object of derived class can be treated as object of base class not vice versa 2 protected more restrictive than public but allows derived classes to know details of parents 3 private prevents objects of derived class from being treated as objects of base class See GradeActivity Version 2 Copyright 2012 Pearson Education Inc Inheritance vs Access Base class members How inherited base class members appear in derived class x is inaccessible private y private z private x protected y public z private base class private x protected y public z protecte d base class x is inaccessible protected y protected z public base class x is inaccessible protected y public z private x protected y public z Copyright 2012 Pearson Education Inc More Inheritance vs Access class Grade private members char letter float score void calcGrade public members void setScore float float getScore char getLetter When Test class inherits from Grade class using public class access it looks like this Copyright 2012 Pearson Education Inc class Test public Grade private members int numQuestions float pointsEach int numMissed public members Test int int private members



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