Question

Implement the classes in the following class diagram. The Book class implements the Comparable interface. Use implements Comparable in the class definition. Now, all book objects are instances of the java.lang.Comparable interface. Write a test program that creates an array of ten books. 1. Use Arrays.sort( Book[]l books) from the java.util package to sort the array. The order of objects in the array is determined using compareTo...) method. 2. Write a method that returns the most expensive book in the array of objects (Books). o The method signature is: public static Book max ( Book[] books) 3. Create another class BookTitleComparator that implements the Comparator interface in which overrides the compare( Book a, Book b) method. Use the implements Comparator in the class definition in order to compare objects of type Book. The compare(Book a, Book b) method should compare the titles of the two books. 4. Using Arrays.sort( Book[] books, new BookTitleComparator() ) to sort books by the title. o Arrays.sort( books, new BookTitleComparator() ); 5. Create a method to show each element in the array with the following method signature: o public static void showBooksArray ( books ) Book MyDate title: String author : Arraylists Authors o 1 MyDate from publishing: MyDate price: Double Bookf title String author Author, publiching: MyDate, price: Doublel set Titlel title: String): void + setAuthorf title: String): voild setDatel date: MyDate ): void getDate): MyDate + setPrice price: int): void getPrice 0:int e compareTo( book:Book):int toString):String Author name: String age : int book: ArrayList Book Authorl name:String, age: int) +getName0: String eweak void getAge0 : String getBookf title: String): Book +setBookf book : Book ): void compare (book1:Book, book2 Book): int Class MyDate should have member of type Date and provide methods and constructor to allow User to create object of myDate

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
_________________

// MyDate.java

public class MyDate {
   private int day;
   private int month;
   private int year;

   public MyDate(int day, int month, int year) {
       this.day = day;
       this.month = month;
       this.year = year;
   }

   @Override
   public String toString() {
       return month + "/" + day + "/" + year;
   }

}
______________________

// Author.java

import java.util.ArrayList;

public class Author {
   private String name;
   private int age;
   private ArrayList<Book> book;

   public Author(String name, int age) {
       this.name = name;
       this.age = age;
       book=new ArrayList<Book>();
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public int getAge() {
       return age;
   }

   public void setAge(int age) {
       this.age = age;
   }

   public Book getBook(String title) {
       Book b = null;
       for (int i = 0; i < book.size(); i++) {
           if (book.get(i).equals(title))
               b = book.get(i);
       }
       return b;
   }

   public void setBook(Book book) {
       this.book.add(book);
   }

   @Override
   public String toString() {
       return "Author [name=" + name + ", age=" + age + ", book=" + book + "]";
   }

}
__________________________

// Book.java

import java.util.ArrayList;
import java.util.Date;

public class Book implements Comparable<Book> {
   private String title;
   private double price;
   private ArrayList<Author> author;
   private MyDate publishing;

   public Book(String title, Author author, MyDate publishing, double price) {
       this.author = new ArrayList<Author>();
       this.title = title;
       this.price = price;
       this.author.add(author);
       this.publishing = publishing;
   }

   public String getTitle() {
       return title;
   }

   public void setTitle(String title) {
       this.title = title;
   }

   public double getPrice() {
       return price;
   }

   public void setPrice(double price) {
       this.price = price;
   }

   public ArrayList<Author> getAuthor() {
       return author;
   }

   public void setAuthor(ArrayList<Author> author) {
       this.author = author;
   }

   public MyDate getDate() {
       return publishing;
   }

   public void setDate(MyDate publishing) {
       this.publishing = publishing;
   }

   @Override
   public int compareTo(Book o) {
       if (getPrice() == o.getPrice())
           return 0;
       else if (getPrice() > o.getPrice())
           return 1;
       else
           return -1;

   }

   @Override
   public String toString() {
       return "Book [Title=" + title + ", Price=$" + price + ", Author="
               + author + ", Publishing=" + publishing + "]";
   }

}
______________________________

// BookTitleComparator.java

import java.util.Comparator;

public class BookTitleComparator implements Comparator<Book> {

   @Override
   public int compare(Book a, Book b) {

       return a.getTitle().compareTo(b.getTitle());

   }

}
_________________________

// Test.java

package org.students;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;

public class Test {

   public static void main(String[] args) {
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);
       Book books[] = new Book[10];
       books[0] = new Book("Introduction to java", new Author(
               "Yeshwanth Kanitkar", 23), new MyDate(31, 12, 2000), 43.50);

       books[1] = new Book("Introduction to c", new Author(
               "Yeshwanth Kanitkar", 23), new MyDate(21, 11, 2002), 23.50);
       books[2] = new Book("Wings of fire", new Author("Abdul kalam", 75),
               new MyDate(22, 02, 2006), 55.60);
       books[3] = new Book("Anci C", new Author("Balaguruswamy", 56),
               new MyDate(04, 03, 2001), 65.00);
       books[4] = new Book("Letting Go", new Author("Philip Roth", 49),
               new MyDate(03, 01, 2005), 16.50);
       books[5] = new Book("Fear of Flying", new Author("Erica Jong", 45),
               new MyDate(02, 11, 2007), 26.50);
       books[6] = new Book("Wide Sargasso Sea", new Author("Jean Rhys", 40),
               new MyDate(12, 9, 2009), 23.50);
       books[7] = new Book("When Breath Becomes Air", new Author(
               "Paul Kalanithi", 34), new MyDate(11, 12, 2007), 27.50);
       books[8] = new Book("Genisis", new Author("Wanick", 39), new MyDate(12,
               12, 2012), 34.50);
       books[9] = new Book("A Girl Like I", new Author("Anita Loos", 37),
               new MyDate(11, 02, 2010), 44.50);

       Collections.sort(Arrays.asList(books));
       showBooksArray(books);

       Book bmax = max(books);
       System.out.println("\nMost Expensive Book is :$" + bmax);

       Collections.sort(Arrays.asList(books), new BookTitleComparator());
       System.out.println("\nDisplaying the books info after sorting based on title:");
       showBooksArray(books);
   }

   private static void showBooksArray(Book[] books) {
       for (int i = 0; i < books.length; i++) {
           System.out.println(books[i]);
       }

   }

   private static Book max(Book[] books) {
       double max = books[0].getPrice();
       int indx = 0;
       for (int i = 0; i < books.length; i++) {
           if (max < books[i].getPrice()) {
               max = books[i].getPrice();
               indx = i;
           }
       }
       return books[indx];
   }

}

____________________________

Output:

Book [Title=Letting Go, Price=$16.5, Author=[Author [name=Philip Roth, age=49, book=[]]], Publishing=1/3/2005]
Book [Title=Introduction to c, Price=$23.5, Author=[Author [name=Yeshwanth Kanitkar, age=23, book=[]]], Publishing=11/21/2002]
Book [Title=Wide Sargasso Sea, Price=$23.5, Author=[Author [name=Jean Rhys, age=40, book=[]]], Publishing=9/12/2009]
Book [Title=Fear of Flying, Price=$26.5, Author=[Author [name=Erica Jong, age=45, book=[]]], Publishing=11/2/2007]
Book [Title=When Breath Becomes Air, Price=$27.5, Author=[Author [name=Paul Kalanithi, age=34, book=[]]], Publishing=12/11/2007]
Book [Title=Genisis, Price=$34.5, Author=[Author [name=Wanick, age=39, book=[]]], Publishing=12/12/2012]
Book [Title=Introduction to java, Price=$43.5, Author=[Author [name=Yeshwanth Kanitkar, age=23, book=[]]], Publishing=12/31/2000]
Book [Title=A Girl Like I, Price=$44.5, Author=[Author [name=Anita Loos, age=37, book=[]]], Publishing=2/11/2010]
Book [Title=Wings of fire, Price=$55.6, Author=[Author [name=Abdul kalam, age=75, book=[]]], Publishing=2/22/2006]
Book [Title=Anci C, Price=$65.0, Author=[Author [name=Balaguruswamy, age=56, book=[]]], Publishing=3/4/2001]

Most Expensive Book is :$Book [Title=Anci C, Price=$65.0, Author=[Author [name=Balaguruswamy, age=56, book=[]]], Publishing=3/4/2001]

Displaying the books info after sorting based on title:
Book [Title=A Girl Like I, Price=$44.5, Author=[Author [name=Anita Loos, age=37, book=[]]], Publishing=2/11/2010]
Book [Title=Anci C, Price=$65.0, Author=[Author [name=Balaguruswamy, age=56, book=[]]], Publishing=3/4/2001]
Book [Title=Fear of Flying, Price=$26.5, Author=[Author [name=Erica Jong, age=45, book=[]]], Publishing=11/2/2007]
Book [Title=Genisis, Price=$34.5, Author=[Author [name=Wanick, age=39, book=[]]], Publishing=12/12/2012]
Book [Title=Introduction to c, Price=$23.5, Author=[Author [name=Yeshwanth Kanitkar, age=23, book=[]]], Publishing=11/21/2002]
Book [Title=Introduction to java, Price=$43.5, Author=[Author [name=Yeshwanth Kanitkar, age=23, book=[]]], Publishing=12/31/2000]
Book [Title=Letting Go, Price=$16.5, Author=[Author [name=Philip Roth, age=49, book=[]]], Publishing=1/3/2005]
Book [Title=When Breath Becomes Air, Price=$27.5, Author=[Author [name=Paul Kalanithi, age=34, book=[]]], Publishing=12/11/2007]
Book [Title=Wide Sargasso Sea, Price=$23.5, Author=[Author [name=Jean Rhys, age=40, book=[]]], Publishing=9/12/2009]
Book [Title=Wings of fire, Price=$55.6, Author=[Author [name=Abdul kalam, age=75, book=[]]], Publishing=2/22/2006]

_______________Could you plz rate me well.Thank You