Question

Write a class called Book. Here are the relevant attributes:

title

author

yearPublished

           bookPriceInCAD

Provide a constructor that takes parameters to initialize all the instance variables. The constructor calls the mutator (set) methods to initialize the instance variables.

Provide an accessor (get) and mutator (set) for each instance variable. The mutators all validate their parameters appropriately and use them only if valid. If the passed parameter was invalid an IllegalArgumentException will be thrown with a proper error message

A String value is considered valid if it was not null or an empty String and a numeric value is considered valid if it was a non-negative value

Provide a method to display the book's information on the screen.

Create another class called BookStore. Here are the relevant attributes:

              business name

array list of Book

Provide two constructors; the no-args constructor sets the business name to “Book Store”. The second constructor takes a parameter to initialize the business name. Both constructors create the ArrayList object

Provide an accessor (get) for each instance variable and mutator (set) for the String type instance variable.

Provide a method that adds a new book to the collection if the passed object was not null. Here is the method signature:

public void addBook(Book book)

Provide a method that takes an int parameter and displays on the screen the details of the book stored at that index position. This method must ensure that the parameter is a valid index position and display an error message if it is not.

Provide a method that takes a String parameter (the book title), searches the collection and displays the details of the Book object if the book was found in the collection. If the book was not in the collection the method will display a message stating that the book was not found. To compare strings use the equalsIgnoreCase() method of the String class.

Provide a method that uses for-each loop to display the details of all the books in the collection.

Create a mian method.In the method create three Book objects and add them to the ArrayList using method addBook().

Call the method that takes an int parmeter to display the book details and pass it 4 , then call it and pass the value 2.

Call the method that takes a String parameter and pass it a title of a book that does not exist in the collection then call the same method with a title of one of the books created earlier in the main method. Finally call a method to display all the details of all the books in the collection

Answer 1

Answer:

Here is the code and the screenshot, please refer the comments section for better understanding of the code. Also, do leave a comment if you have any questions/ doubts/ clarifications. I'll be glad to help you out. There are 2 classes which I am providing you, they are straight forward and simple. There is a main method in BookStore.java you can use for more testing. Thank you, Good Luck !!!

Book.java

public class Book { // attributes private String title; private String author; private int yearPublished ; private int bookPriceInCAD; // Constructors public Book(String title, String author, int yearPublished, int bookPriceInCAD) { this.title = title; this.author = author; this.yearPublished = yearPublished; this.bookPriceInCAD = bookPriceInCAD; } public Book() { } // Getters and Setters public String getTitle() { return title; } public void setTitle(String title) throws java.lang.Exception { if (title == null || title.length() == 0 || title.isEmpty()){ throw new IllegalArgumentException("Error in title"); // throw exception }else { this.title = title; } } public String getAuthor() { return author; } public void setAuthor(String author) { if (author == null || author.length() == 0 || author.isEmpty()){ throw new IllegalArgumentException("Error in author name"); // throw exception }else { this.author = author; } } public int getYearPublished() { return yearPublished; } public void setYearPublished(int yearPublished) { if (yearPublished <=0){ throw new IllegalArgumentException("Error in setting the published year"); // throw exception }else { this.yearPublished = yearPublished; } } public int getBookPriceInCAD() { return bookPriceInCAD; } public void setBookPriceInCAD(int bookPriceInCAD) { if (bookPriceInCAD <=0){ throw new IllegalArgumentException("Error in setting the book price in CAD"); // throw exception }else { this.bookPriceInCAD = bookPriceInCAD; } } @Override public String toString() { //helps in displaying return "Book{" + "title='" + title + '\'' + ", author='" + author + '\'' + ", yearPublished=" + yearPublished + ", bookPriceInCAD=" + bookPriceInCAD + '}'; } } 

---------------------------------------------------------------------------------------------------------------------------------------

BookStore.java

import java.util.ArrayList; public class BookStore { private String businessName; private ArrayList<Book> bookArrayList; public BookStore(String businessName) { this.businessName = businessName; this.bookArrayList = new ArrayList<>(); } public BookStore() { this.businessName = "Book Store"; this.bookArrayList = new ArrayList<>(); } public BookStore(String businessName, ArrayList<Book> bookArrayList) { this.businessName = businessName; this.bookArrayList = bookArrayList; } public String getBusinessName() { return businessName; } public void setBusinessName(String businessName) { this.businessName = businessName; } public ArrayList<Book> getBookArrayList() { return bookArrayList; } public void setBookArrayList(ArrayList<Book> bookArrayList) { this.bookArrayList = bookArrayList; } public void addBook(Book book){ if (book != null){ bookArrayList.add(book); } } public void displayBookInfo(int i){ try{ Book b = this.bookArrayList.get(i); System.out.println(b); }catch (java.lang.Exception e){ System.out.println("Enter a valid integer, entered int is out of range ..."); } } public void searchBookByName(String bookName){ boolean flag = false; for (Book b : bookArrayList){ if (b.getTitle().equalsIgnoreCase(bookName)){ System.out.println(b); flag = true; break; } } if (flag == false){ System.out.println("Book not found ..."); } } public void displayBooks(){ for (Book b : bookArrayList){ System.out.println(b); } } public static void main(String [] args){ BookStore bookStore = new BookStore(); Book book1 = new Book("Operating System", "Galvin Silbechatz", 2000, 40 ); Book book2 = new Book("Complete Reference Java 11", "Hubert", 2018, 45 ); Book book3 = new Book("Let us C", "Yeshwanth Kanitkar", 1999,10); // adding books to bookstore bookStore.addBook(book1); bookStore.addBook(book2); bookStore.addBook(book3); // displaying out of range bookStore.displayBookInfo(4); // Valid range, displaying the book bookStore.displayBookInfo(2); // Search a book with invalid title bookStore.searchBookByName("Expert Guide"); // Search a book with valid title bookStore.searchBookByName("Complete Reference Java 11"); // Display all the books bookStore.displayBooks(); } } 

----------------------------------------------------------------------------------------------------

Screenshot - Book.java

BookShop.java