The author and book classes is given if it is needed. As well as, the sample data file. public class Author { private String name; public Author (String name){ this.name= name; } public String toString(){ return name; } public boolean equals(Object obj){ return this.toString().equals(obj.toString()); } public int hashCode(){ return name.hashCode(); } } import java.util.*; public class Book { private String title; private double averageRating; private String ISBN; private int numPages; public Set authors; public Book(){ authors=new HashSet<>(); //initialise authors } public Book(String title, double averageRating, String isbn, int numPages){ this.title = title; this.averageRating = averageRating; this.ISBN = isbn; this.numPages = numPages; authors=new HashSet<>(); //initialise authors } //accessors public String getTitle(){ return title; } public double getAverageRating(){ return averageRating; } public String getISBN(){ return ISBN; } public int getNumPages(){ return numPages; } public String getAuthorList(){ String authorList =""; for(Author a: authors) //for each Author in collection authorList+=a.toString(); //append the name to authorList return authorList; } //mutators public void setTitle(String title){ this.title = title; } public void setAverageRating(double averageRating){ this.averageRating = averageRating; } public void setISBN(String isbn){ this.ISBN = isbn; } public void setNumPages(int numPages){ this.numPages = numPages; } public void addAuthor(Author a){ /* Inserts a new Author into the author list. No duplicates are allowed */ authors.add(a); //adds a if not present } public boolean isAuthoredBy(Author a){ /* Returns true if the Book is authored by the supplied author false otherwise */ for(Author auth:authors) //for each Author in collection { if(a.equals(auth)) //if auth and a are same return true; } return false; } public String toStringTitleFirst(){ return getTitle() + ", " + getAuthorList() + " " + getAverageRating() + ", " + getISBN() + ", " + getNumPages() + " pages."; } public String toStringISBNFirst(){ return getISBN() + " " + getTitle() + ", " + getAuthorList() + " " + getAverageRating() + ", " + ", " + getNumPages() + " pages."; } public String toStringRatingFirst(){ return getAverageRating() + " " + getTitle() + ", " + getAuthorList() + " " + getISBN() + ", " + ", " + getNumPages() + " pages."; } public String toStringPagesFirst(){ return getNumPages() + " pages " + getTitle() + ", " + getAuthorList() + " " + getISBN() + ", " + ", " + getAverageRating() ; } public boolean equals(Object obj){ return (Book)obj.getISBN().equals(ISBN); //checks ISBN } public int hashCode(){ return ISBN.hashCode(); } } DataReader.java: A class that reads data from a sample data file. You will need to modify this class to create Book and Author objects, associate them and then return a filled Book[ ] array. You have to extract the Author data from the lines yourself where the “/“ delimiter separates multiple author names. import java.io.File; import java.util.Scanner; public class DataReader { public Book[ ] readFile(){ try{ String path = "100books.txt"; File dataFile = new File(path); Scanner fileReader = new Scanner(dataFile); String[] bookdetails = new String[5]; String line; while(fileReader.hasNextLine()) { line = fileReader.nextLine(); bookdetails = line.split(","); System.out.println(bookdetails[0] +"," +bookdetails[1]+"," +bookdetails[2]+"," +bookdetails[3]+"," +bookdetails[4]); } fileReader.close(); } catch(Exception e){ System.out.println(e.toString()); } return null; } }
Hi, can i please get assistance with the following Java class to read data below? Add anything relevant if needed only. The author and book classes is given if it is needed. As well as, the sample data file.
public class Author {
private String name;
public Author (String name){
this.name= name;
}
public String toString(){
return name;
}
public boolean equals(Object obj){
return this.toString().equals(obj.toString());
}
public int hashCode(){
return name.hashCode();
}
}
import java.util.*;
public class Book {
private String title;
private double averageRating;
private String ISBN;
private int numPages;
public Set<Author> authors;
public Book(){
authors=new HashSet<>(); //initialise authors
}
public Book(String title, double averageRating, String isbn, int numPages){
this.title = title;
this.averageRating = averageRating;
this.ISBN = isbn;
this.numPages = numPages;
authors=new HashSet<>(); //initialise authors
}
//accessors
public String getTitle(){
return title;
}
public double getAverageRating(){
return averageRating;
}
public String getISBN(){
return ISBN;
}
public int getNumPages(){
return numPages;
}
public String getAuthorList(){
String authorList ="";
for(Author a: authors) //for each Author in collection
authorList+=a.toString(); //append the name to authorList
return authorList;
}
//mutators
public void setTitle(String title){
this.title = title;
}
public void setAverageRating(double averageRating){
this.averageRating = averageRating;
}
public void setISBN(String isbn){
this.ISBN = isbn;
}
public void setNumPages(int numPages){
this.numPages = numPages;
}
public void addAuthor(Author a){
/* Inserts a new Author into the author list. No duplicates are allowed */
authors.add(a); //adds a if not present
}
public boolean isAuthoredBy(Author a){
/* Returns true if the Book is authored by the supplied author
false otherwise */
for(Author auth:authors) //for each Author in collection
{
if(a.equals(auth)) //if auth and a are same
return true;
}
return false;
}
public String toStringTitleFirst(){
return getTitle() + ", " + getAuthorList() + " " + getAverageRating() + ", " + getISBN() + ", " + getNumPages() + " pages.";
}
public String toStringISBNFirst(){
return getISBN() + " " + getTitle() + ", " + getAuthorList() + " " + getAverageRating() + ", " + ", " + getNumPages() + " pages.";
}
public String toStringRatingFirst(){
return getAverageRating() + " " + getTitle() + ", " + getAuthorList() + " " + getISBN() + ", " + ", " + getNumPages() + " pages.";
}
public String toStringPagesFirst(){
return getNumPages() + " pages " + getTitle() + ", " + getAuthorList() + " " + getISBN() + ", " + ", " + getAverageRating() ;
}
public boolean equals(Object obj){
return (Book)obj.getISBN().equals(ISBN); //checks ISBN
}
public int hashCode(){
return ISBN.hashCode();
}
}
DataReader.java: A class that reads data from a sample data file. You will need to modify this class to create Book and Author objects, associate them and then return a filled Book[ ] array. You have to extract the Author data from the lines yourself where the “/“ delimiter separates multiple author names.
import java.io.File;
import java.util.Scanner;
public class DataReader {
public Book[ ] readFile(){
try{
String path = "100books.txt";
File dataFile = new File(path);
Scanner fileReader = new Scanner(dataFile);
String[] bookdetails = new String[5];
String line;
while(fileReader.hasNextLine()) {
line = fileReader.nextLine();
bookdetails = line.split(",");
System.out.println(bookdetails[0] +"," +bookdetails[1]+"," +bookdetails[2]+"," +bookdetails[3]+"," +bookdetails[4]);
}
fileReader.close();
}
catch(Exception e){
System.out.println(e.toString());
}
return null;
}
}
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