Question: I cannot get this code to work. Please make it so I can put it in IntelliJ and run it package com.project.books; import java.io.BufferedReader; import
I cannot get this code to work. Please make it so I can put it in IntelliJ and run it
package com.project.books;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;
public class DriverClass {
//not enough time to add comments..hope you understand...
public static void main(String[] args) throws IOException {
Scanner scan = new Scanner(System.in);
BufferedReader br = null;
Books books;
ArrayList
// Adding sample Data to the array list
Books b0 = new Books("First Book", "author,one", "123-1234512345", 4.5, 1);
b0.setAverageRating(4.5);
Books b1 = new Books("Second Book", "author,two", "456-1234512345", 4.7, 1);
b1.setAverageRating(4.7);
Books b2 = new Books("Third Book", "author,three", "789-1234512345", 3.4, 1);
b2.setAverageRating(3.4);
ar.add(b0);
ar.add(b1);
ar.add(b2);
System.out.println("Choose a menu option from the list below: ");
System.out.println(" " + "Choose a menu option from the list below: "
+ " 1: Load book data from a file " + " 2: Add one new book " + " 3: Rate one book "
+ " 4: Get recommendations " + " 5: Print the full book list " + " 6: Exit the software");
try {
int option = scan.nextInt();
while (option != 6) {
switch (option) {
case 1:
System.out.println("Enter the file name(for eg., Books)");
String bookName = scan.next();
if (bookName.equals("Books")) {
loadBookData(br, bookName);
} else {
System.out.println("File for" + bookName + " found!!!!!!!!");
}
break;
case 2:
System.out.println("Enter the book title:");
scan.nextLine();
String bookTitle = scan.nextLine();
System.out.println("Enter the author(lastName,firstName with no spaces)");
String author = scan.next();
System.out.println("Enter the 13 digit ISBN: ");
String isbnNo = scan.next();
addNewBook(bookTitle, author, isbnNo, ar);
break;
case 3:
System.out.println("Enter the ISBN: ");
String isbn = scan.next();
boolean found = false;
for (Books book : ar) {
if (book.getIsbn().equals(isbn)) {
System.out.println("Enter the rating: ");
double rating = scan.nextDouble();
rateBook(ar, isbn, rating, book);
found = true;
break;
}
}
if (found) {
System.out.println("The record for " + isbn + " was updated");
} else {
System.out.println("The record for " + isbn + " was not found");
}
break;
case 4:
Collections.sort(ar, new SortClass());
for (Books book : ar) {
System.out.println(String.format("%1$-18f %2$-10d %3$-10s %4$-10s %5$-10s", book.getAverageRating(),
book.getNoOfReviews(), book.getIsbn(), book.getAuthor(), book.getTitle()));
}
break;
case 5:
for (Books book : ar) {
System.out.println(String.format("%1$-18f %2$-10d %3$-10s %4$-10s %5$-10s", book.getRating(),
book.getNoOfReviews(), book.getIsbn(), book.getAuthor(), book.getTitle()));
}
break;
default:
System.out.println("please select a proper option!!!");
break;
}
System.out.println("Enter an option:");
option = scan.nextInt();
}
} finally {
if (br != null)
br.close();
System.out.println("Exiting the program...");
}
}
static void loadBookData(BufferedReader br, String bookName) throws IOException {
br = new BufferedReader(new FileReader(bookName + ".txt"));
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
sb.append(line);
sb.append(System.lineSeparator());
line = br.readLine();
}
String everything = sb.toString();
System.out.println(everything);
}
static void addNewBook(String title, String author, String isbn, ArrayList
Books books = new Books();
books.setAuthor(author);
books.setTitle(title);
books.setIsbn(isbn);
ar.add(books);
}
static void rateBook(ArrayList
int reviews=0;
for (Books books : ar) {
if (book.getIsbn().equals(isbn)) {
book.setRating(rating);
reviews=book.getNoOfReviews();
}
}
book.setNoOfReviews(++reviews);
double averageRating=0.0;
for (Books books : ar) {
if (book.getIsbn().equals(isbn)) {
averageRating+=book.getRating();
averageRating/=book.getNoOfReviews();
}
}
book.setAverageRating(averageRating);
}
}
class SortClass implements Comparator
@Override
public int compare(Books o1, Books o2) {
return o1.getRating() == o2.getRating() ? 0 : o1.getRating() < o2.getRating() ? 1 : -1;
}
}
/***POJO class for Books***//
package com.project.books;
public class Books {
private String title;
private String author;
private String isbn;
private double rating;
private int noOfReviews;
private double averageRating;
public Books() {
super();
}
@Override
public String toString() {
return "Books [title=" + title + ", author=" + author + ", isbn=" + isbn + ", rating=" + rating
+ ", noOfReviews=" + noOfReviews + "]";
}
public Books(String title, String author, String isbn, double rating, int noOfReviews) {
super();
this.title = title;
this.author = author;
this.isbn = isbn;
this.rating = rating;
this.noOfReviews = noOfReviews;
}
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 String getIsbn() {
return isbn;
}
public void setIsbn(String isbn) {
this.isbn = isbn;
}
public double getRating() {
return rating;
}
public void setRating(double rating) {
this.rating = rating;
}
public int getNoOfReviews() {
return noOfReviews;
}
public void setNoOfReviews(int noOfReviews) {
this.noOfReviews = noOfReviews;
}
public double getAverageRating() {
return averageRating;
}
public void setAverageRating(double averageRating) {
this.averageRating = averageRating;
}
}
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