reference is used to refer to a child class object. class Main ( public static void main(String(] args) { Animal al: al - new Animal (); a1. displayInfo (); al - nev Dog () ; al. displayinfo (); Figure 2. Polymorphism (a) Create a class name Animal to produce a method named displayInfo (). Define the method by displaying info that represent the class name.

reference is used to refer to a child class object. class Main ( public static void main(String(] args) { Animal al: al - new Animal (); a1. displayInfo (); al - nev Dog () ; al. displayinfo (); Figure 2. Polymorphism (a) Create a class name Animal to produce a method named displayInfo (). Define the method by displaying info that represent the class name.

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter11: Advanced Inheritance Concepts

Section: Chapter Questions

Problem 14RQ

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object oriented programming using c++ class decleration: class MyPhoneBook{ string* names; string* phones; int phoneBookSize; public: MyPhoneBook(int); //Takes size MyPhoneBook(const MyPhoneBook&); //Copy Constructor bool addEntry(string ,string); bool displayEntryAtIndex(int); void displayEntryAtIndices(int*); void displayAll(); int* findByName(string); int* findByPhone(string); bool updateNameAt(string, int); bool updatePhoneAt(string, int); ~MyPhoneBook();};
class IndexItem { public: virtual int count() = 0; virtual void display()= 0; };class Book : public IndexItem { private: string title; string author; public: Book(string title, string author): title(title), author(author){} virtual int count(){ return 1; } virtual void display(){ /* YOU DO NOT NEED TO IMPLEMENT THIS FUNCTION */ } };class Category: public IndexItem { private: /* fill in the private member variables for the Category class below */ ? int count; public: Category(string name, string code): name(name), code(code){} /* Implement the count function below. Consider the use of the function as depicted in main() */ ? /* Implement the add function which fills the category with contents below. Consider the use of the function as depicted in main() */ ? virtualvoiddisplay(){ /* YOU DO NOT NEED TO IMPLEMENT THIS FUNCTION */ } };
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