Which of the following are incorrect? Select 3 correct answer(s) An abstract class contains constructors. The constructors in an abstract class should be protected. The constructors in an abstract class are private. You may declare a final abstract class. An interface may contain constructors.

Which of the following are incorrect? Select 3 correct answer(s) An abstract class contains constructors. The constructors in an abstract class should be protected. The constructors in an abstract class are private. You may declare a final abstract class. An interface may contain constructors.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is:

Question

Make 3 choices.
Which of the following are incorrect?
Select 3 correct answer(s)
An abstract class contains constructors.
The constructors in an abstract class should be protected.
The constructors in an abstract class are private.
You may declare a final abstract class.
An interface may contain constructors.

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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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