Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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public class Book {

protected String title;
protected String author;
protected String publisher;
protected String publicationDate;

public void setTitle(String userTitle) {
title = userTitle;
}

public String getTitle() {
return title;
}

public void setAuthor(String userAuthor) {
author = userAuthor;
}

public String getAuthor(){
return author;
}

public void setPublisher(String userPublisher) {
publisher = userPublisher;
}

public String getPublisher() {
return publisher;
}

public void setPublicationDate(String userPublicationDate) {
publicationDate = userPublicationDate;
}

public String getPublicationDate() {
return publicationDate;
}

public void printInfo() {
System.out.println("Book Information: ");
System.out.println(" Book Title: " + title);
System.out.println(" Author: " + author);
System.out.println(" Publisher: " + publisher);
System.out.println(" Publication Date: " + publicationDate);
}
}

import java.util.Scanner;

public class BookInformation {
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);

Book myBook = new Book();
Encyclopedia myEncyclopedia = new Encyclopedia();

String title, author, publisher, publicationDate;
String eTitle, eAuthor, ePublisher, ePublicationDate, edition;
int numPages;

title = scnr.nextLine();
author = scnr.nextLine();
publisher = scnr.nextLine();
publicationDate = scnr.nextLine();

eTitle = scnr.nextLine();
eAuthor = scnr.nextLine();
ePublisher = scnr.nextLine();
ePublicationDate = scnr.nextLine();
edition = scnr.nextLine();
numPages = scnr.nextInt();

myBook.setTitle(title);
myBook.setAuthor(author);
myBook.setPublisher(publisher);
myBook.setPublicationDate(publicationDate);
myBook.printInfo();

myEncyclopedia.setTitle(eTitle);
myEncyclopedia.setAuthor(eAuthor);
myEncyclopedia.setPublisher(ePublisher);
myEncyclopedia.setPublicationDate(ePublicationDate);
myEncyclopedia.setEdition(edition);
myEncyclopedia.setNumPages(numPages);
myEncyclopedia.printInfo();

}
}

[画像:```java public class Encyclopedia extends Book { // TODO: Declare private fields // TODO: Define mutator methods - // setEdition(), setNumPages() // TODO: Define accessor methods - // getEdition(), getNumPages() // TODO: Define a printInfo() method that overrides // the printInfo in Book class } ``` ### Explanation: This code snippet is a Java class outline for `Encyclopedia` that inherits from the `Book` class. It includes placeholders (TODOs) indicating the steps needed to implement the class fully: 1. **Declare Private Fields:** - Private fields are not defined yet, but they will be used to store the state of an `Encyclopedia` object, such as edition and number of pages. 2. **Mutator Methods (Setters):** - `setEdition()`: Method to set the edition of the encyclopedia. - `setNumPages()`: Method to set the number of pages. 3. **Accessor Methods (Getters):** - `getEdition()`: Method to retrieve the edition of the encyclopedia. - `getNumPages()`: Method to retrieve the number of pages. 4. **`printInfo()` Method:** - This method is intended to override a method from the `Book` class to provide specific details relevant to the `Encyclopedia` class. These steps involve encapsulating the data and overriding methods to customize the behavior of objects of this class.]
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Transcribed Image Text:```java public class Encyclopedia extends Book { // TODO: Declare private fields // TODO: Define mutator methods - // setEdition(), setNumPages() // TODO: Define accessor methods - // getEdition(), getNumPages() // TODO: Define a printInfo() method that overrides // the printInfo in Book class } ``` ### Explanation: This code snippet is a Java class outline for `Encyclopedia` that inherits from the `Book` class. It includes placeholders (TODOs) indicating the steps needed to implement the class fully: 1. **Declare Private Fields:** - Private fields are not defined yet, but they will be used to store the state of an `Encyclopedia` object, such as edition and number of pages. 2. **Mutator Methods (Setters):** - `setEdition()`: Method to set the edition of the encyclopedia. - `setNumPages()`: Method to set the number of pages. 3. **Accessor Methods (Getters):** - `getEdition()`: Method to retrieve the edition of the encyclopedia. - `getNumPages()`: Method to retrieve the number of pages. 4. **`printInfo()` Method:** - This method is intended to override a method from the `Book` class to provide specific details relevant to the `Encyclopedia` class. These steps involve encapsulating the data and overriding methods to customize the behavior of objects of this class.
[画像:Given the `main()` function and a base `Book` class, define a derived class called `Encyclopedia` with member methods to get and set private fields of the following types: - String to store the edition - Int to store the number of pages Within the derived `Encyclopedia` class, define a `printInfo()` method that overrides the `Book` class's `printInfo()` method by printing the title, author, publisher, publication date, edition, and number of pages. **Example:** If the input is: ``` The Hobbit J. R. R. Tolkien George Allen & Unwin 21 September 1937 The Illustrated Encyclopedia of the Universe Ian Ridpath Watson-Guptill 2001 2nd 384 ``` The output is: ``` Book Information: Book Title: The Hobbit Author: J. R. R. Tolkien Publisher: George Allen & Unwin Publication Date: 21 September 1937 Book Information: Book Title: The Illustrated Encyclopedia of the Universe Author: Ian Ridpath Publisher: Watson-Guptill Publication Date: 2001 Edition: 2nd Number of Pages: 384 ``` **Note:** Indentations use 3 spaces.]
expand button
Transcribed Image Text:Given the `main()` function and a base `Book` class, define a derived class called `Encyclopedia` with member methods to get and set private fields of the following types: - String to store the edition - Int to store the number of pages Within the derived `Encyclopedia` class, define a `printInfo()` method that overrides the `Book` class's `printInfo()` method by printing the title, author, publisher, publication date, edition, and number of pages. **Example:** If the input is: ``` The Hobbit J. R. R. Tolkien George Allen & Unwin 21 September 1937 The Illustrated Encyclopedia of the Universe Ian Ridpath Watson-Guptill 2001 2nd 384 ``` The output is: ``` Book Information: Book Title: The Hobbit Author: J. R. R. Tolkien Publisher: George Allen & Unwin Publication Date: 21 September 1937 Book Information: Book Title: The Illustrated Encyclopedia of the Universe Author: Ian Ridpath Publisher: Watson-Guptill Publication Date: 2001 Edition: 2nd Number of Pages: 384 ``` **Note:** Indentations use 3 spaces.
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