Write a Book class in a file named Book.java. Later, we will use the class to he
ID: 3690342 • Letter: W
Question
Write a Book class in a file named Book.java. Later, we will use the class to help us implement a library or patron. But for this part, we're just working on books. This class will be the template or “cookie cutter” (as discussed in class) for book objects.
The class needs to have the following private instance variables to store the “state” of the book;
Title (String): the book's title
Author (String): the book's author
borrowed (boolean): indicates whether or not a book is currently borrowed (checked-out)
The class also needs to implement the following instance methods:
a constructor: takes two String arguments: the first is the title and the second is the author
borrowBook(): marks a book as borrowed
returnBook(): marks a book as NOT borrowed
getTitle(): returns the title of a book
getAuthor(): returns the author of a book
getBorrowed(): returns whether or not a book is currently borrowed
toString(): returns the "state" of a book (author, title and borrowed status) in a nice format.
Spend some time thinking about these methods. What should they return? To help you out, take a look at the
TestBook.java file. This file has one method (main) which instantiates a book and then invokes
methods on that object to test its behavior. You should not change TestBook.java
other than to comment out portions as you work on your methods in
Book.java.
When your Book class is implemented (ie all the instance variables and instance methods are working correctly, the output of that program should be:
Title (should be The Hobbit): The Hobbit
Author (should be J.R.R. Tolkien): J.R.R. Tolkien
Borrowed? (should be false): false
Borrowed? (should be true): true
Borrowed? (should be false): false
Notes and hints:
•You should get a small part working at a time. Start by commenting out the entire main methodin
TestBook.java except for the first line. Since this line of code tests the constructor, you'll
need to get the constructor working first. Then uncomment the next small section of code and get that working in TestBook.java.
•Do NOT modify the main method in any substantial way.
•Don't forget to implement the toString method and test it. This is the only method not tested in TestBook.java, so you will need to add the line of code:
System.out.println(b1);
to the main method. If your toString method is implemented correctly, the above line will print out the information about the book.
Explanation / Answer
//Bookprogram
import java.util.Scanner;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author RAM
*/
public class Book {
private String Title;
private String Author;
private boolean borrowed;
public String getTitle() {
return Title;
}
public void setTitle(String Title) {
this.Title = Title;
}
public String getAuthor() {
return Author;
}
public void setAuthor(String Author) {
this.Author = Author;
}
public boolean isBorrowed() {
return borrowed;
}
public void setBorrowed(boolean borrowed) {
this.borrowed = borrowed;
}
//instance methods
public void borrowBook(){
System.out.println("Borrowed ?");
Scanner s = new Scanner(System.in);
boolean flag = s.nextBoolean();
System.out.println("Borrowed "+flag);
}
public void returnBook(){
System.out.println("return Book");
}
public String toString(){
String status ="True";
return status;
}
}
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package book;
/**
*
* @author RAM
*/
class TestBook {
public static void main(String[] args) {
//test out constructor
Book b1 = new Book("The Hobbit", "J.R.R. Tolkien");
/* //test out accessor methods for title and author
System.out.println("Title (should be The Hobbit): " + b1.getTitle() );
System.out.println("Author (should be J.R.R. Tolkien): " + b1.getAuthor() );
//test out borrowing mechanism
System.out.println("Is borrowed? (should be false): " + b1.getBorrowed() );
b1.borrowBook();
System.out.println("Is borrowed? (should be true): " + b1.getBorrowed() );
//test out returning mechanism
b1.returnBook();
System.out.println("Is borrowed? (should be false): " + b1.getBorrowed() );*/
}
}
}
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