A library contains books and DVDS, which can be checked out andreturned. A warning is sent to borrowers who have overdue items. Bookscan be renewed but DVDS cannot, and DVDS have a shorter loan periodthan books. The library may expand in future to include other kinds ofitems.Suppose you are designing classes for the library. Which of the designsbelow is most appropriate?O A Libraryltem parent class that stores common information such as due date,and child classes Book and DVD.O A Book class and a DVD class that are unrelated, and a Libraryltem class thatstores an instance of Book or DVD in an instance attributeO A Book class and a DVD class that have no relationshipO A Libraryltem class whose attributes can be initialized differently depending on

Ans.) Option B i.e. A Book class and Dvd class that are unrelated and a Library class that stores…

renewed but DVDS cannot, and DVDS have a shorter loan perio oks. The library may expand in future to include other kinds of e you are designing classes for the library. Which of the designs s most appropriate? praryltem parent class that stores common information such as due date, child classes Book and DVD. ok class and a DVD class that are unrelated, and a Libraryltem class that es an instance of Book or DVD in an instance attribute

renewed but DVDS cannot, and DVDS have a shorter loan perio oks. The library may expand in future to include other kinds of e you are designing classes for the library. Which of the designs s most appropriate? praryltem parent class that stores common information such as due date, child classes Book and DVD. ok class and a DVD class that are unrelated, and a Libraryltem class that es an instance of Book or DVD in an instance attribute

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

See similar textbooks

Similar questions

Which of the following statements are true? Group of answer choices 1. A superclass reimplements the functionality of its subclasses. 2. A class that implements an interface reuses the functionality of the interface. 3. A derived class reuses the functionality instead of reimplements it. 4. If a class has no bugs, we can inherit from it without fear of having any bugs in our class.
Create one class check in pets per.Java class file must include all attributes with appropriate data structures at least one constructor method must initialize petType, petName, perAge, and daysStay attributes accessors and mutators for all attributes not required to connect to other classes or run as program practice creating class from uml diagram
What is inherited in a subclass from its superclass? O class members O constructors class members and constructors O private methods O attributes and constructors O None of the above.
Use the Animal class file given on the final exam module. Use Inheritance and Polymorphism concepts to create the following classes and functions. Create the following classes that derive from the Animal class. Monkey Kangaroo Create a derived class named Spider Monkey whose base class is Monkey. Create constructors for each class. Create destructors for each class. All classes will have the following private instance fields, including Animal legs that will initialize to 0 boolean swim that will initialize to false; All classes will have the following polymorphic methods, including Animal getLegs( ) – this returns the number of legs the animal has makeSount( ) – this outputs the type of sound the animal makes makeSound( ) method will be a virtual function in the Animal class Create an exception in the getLegs( ) method that makes sure the number of legs are valid (only allow positive number amount of legs) Create a main method to demonstrate the all functions including the…
Class Relationships Exercises 1. In Java, we use inheritance for "is-a" relationships. Containment, on the other hand, indicates that one object has another object. These are "has-a" relationships. For the following relationships, determine if they are a "is-a" or a "has-a" relationship: o bicycle - vehicle o car - engine o pizza - topping o food - pizza o dog - mammal 2. Share with someone else 3 other examples for each of the following relationships: o Inheritance ("is-a" relationship) o Containment ("has-a" relationship) 3. public class PersonInfo { protected String firstName; protected String birthdate; } public class ChildInfo extends PersonInfo { private String schoolName; } public class MotherInfo extends PersonInfo { private String spousename; private ChildInfo children1; private ChildInfo children2; private ChildInfo children3; ... } A. Draw the relationships for the classes above using UML. If a class inherits from another class, draw an open arrow pointing to the base class…