BooksMan import java.util.HashMap;import java.util.ArrayList;class Book{ String title, ISBN; ArrayList authors; public Book (String title, String ISBN, String authors){ this.title = title; this.ISBN = ISBN; this.authors = new ArrayList(); if (authors != null) { String [] authorArray = authors.split(", "); for (int i = 0; i < authorArray.length; i++) { this.authors.add(authorArray[i]); } } } public String getISBN() { return ISBN; } public String getTitle() { return title; } public ArrayList getAuthors() { return authors; }}public class Main { public static HashMap buildMap(Book[] s) { HashMap books = new HashMap(); if (s != null) { // TODO Write the statements here: to manage each book from the parameter array reference to the hashmap } return books; } public static void main(String argv[]) { Book[] bookArray = new Book[4]; for (int i = 0; i < 4; i++) { bookArray[i] = new Book((new Integer(i)).toString(), (new Integer(i)).toString(), "ITSC2214" ); } HashMap books = Main.buildMap(bookArray); System.out.println("The total number of books is " + books.size()); for (int i = 0; i < 4; i++) { System.out.println("Book[" + i + "] is " + books.get((new Integer(i)).toString()).getTitle()); } }} Oscar has given you a list of books. She is tired of deciding what to read byauthor names and now wants to be able to pick them by their unique ISBNlabel. Organize this list of books for Oscar!The books will be given as an array of Book objects. Each book object containsthe information of String title, String ISBN, and String array authors.A Hash Map will need to be declared that keys each book in the array based onthe ISBN String of each book.Example:Book object, titled "Once Upon an Algorithm", authored by Martin Erwid, andwith ISBN = "9780262036634" keys to "9780262036634"Book object, titled "Java Software Structures", authored by John Lewis andJoseph Chase, and with ISBN = "9780133250121" keys to "9780133250121"Let us assume that we already have the Book class defined. The main partinvolved in the question is as follows:class Book{ Let us assume that we already have the Book class defined. The main part involved in the question is as follows:class Book{String title, ISBN3;ArrayList authors;public String getISBN(); //return the ISBN label of a Book objectPlease write missing statements to make the following method buildMap complete. The buildMap method takes abook array s as the parameter and returns a HashMap instance that consists of a collection of pairs of the key ISBNcoupling up with its corresponding book object.public HashMap buildMap(Book[] s) {I/TODO Write the statements hereIn the built-in JAVA package, you could use the JAVA built-in generic class: HashMap and its methods:V get 2 (Object 2 key)Returns the value to which the specified key is mapped, or null if this mapcontains no mapping for the key.put 2 (K key, V value)Associates the specified value with the specified key in this map.The JAVA API reference webpage is at https://docs.oracle.com/javase/7/docs/api/e

If you clearly observe this the key we are going to map a Book object is same as that of ISBN number…

Answered: Please write missing statements to make…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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BooksMan import java.util.HashMap; import java.util.ArrayList; class Book{ String title, ISBN; ArrayList authors; public Book (String title, String ISBN, String authors){ this.title = title; this.ISBN = ISBN; this.authors = new ArrayList(); if (authors != null) { String [] authorArray = authors.split(", "); for (int i = 0; i < authorArray.length; i++) { this.authors.add(authorArray[i]); } } } public String getISBN() { return ISBN; } public String getTitle() { return title; } public ArrayList getAuthors() { return authors; } } public class Main { public static HashMap buildMap(Book[] s) { HashMap books = new HashMap(); if (s != null) { // TODO Write the statements here: to manage each book from the parameter array reference to the hashmap } return books; } public static void main(String argv[]) { Book[] bookArray = new Book[4]; for (int i = 0; i < 4; i++) { bookArray[i] = new Book((new Integer(i)).toString(), (new Integer(i)).toString(), "ITSC2214" ); } HashMap books = Main.buildMap(bookArray); System.out.println("The total number of books is " + books.size()); for (int i = 0; i < 4; i++) { System.out.println("Book[" + i + "] is " + books.get((new Integer(i)).toString()).getTitle()); } } }