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Tim · Guest

Hello all!
Very new to Java need to complete this assignment for a school
project. The code below creates a few books (Title, Author or Authors,
Publisher, Number of pages, Publication Date etc.)
Methods have been developed to display a book's information and to
compare two books by title, number of pages and, HERE IS THE PROBLEM,
publication date.

Date has to be in the "dd-MM-yyyy" format.

The code works alright if we leave out the compPubDate method (line
55) and the calling of that method at line 95.

The message I get from the compiler is this:

Library.java:95: unreported exception java.text.ParseException; must
be caught or declared to be thrown
book2.compPubDate(book4);

There must be something wrong with my method that I don't understand.
Could anyone please help me fix this for me? Any help would be greatly
appreciated!

import java.util.*;
import java.text.*;

class Book {
String title;
String author1;
String author2;
String author3;
String pubdate;
String isbn;
int numpages;
String publisher;

Book(String title, String author1, String author2, String author3,
String pubdate, String isbn, int numpages, String publisher) {
this.title = title;
this.author1 = author1;
this.author2 = author2;
this.author3 = author3;
this.pubdate = pubdate;
this.isbn = isbn;
this.numpages = numpages;
this.publisher = publisher;
}

void bookData (Book book1) {
System.out.println("Title: " + book1.title + 'n' + "Author1: " +
book1.author1 + 'n' + "Author2: " + book1.author2 + 'n' + "Author3:
" + book1.author3);
System.out.println("Publication Date: " + book1.pubdate + 'n' +
"ISBN: " + book1.isbn + 'n' + "Number of Pages: " + book1.numpages);
System.out.println("Publisher: " + book1.publisher + 'n');
}

void compPages(Book otherBook) {
if (this.numpages > otherBook.numpages)
System.out.println("nThe book " + this.title + ", has more pages
than book " + otherBook.title + " hasn");
else if (this.numpages < otherBook.numpages)
System.out.println("nThe book " + otherBook.title + ", has more
pages than book " + this.title + " hasn");
else if (this.numpages == otherBook.numpages)
System.out.println("nThe book " + this.title + ", has the same
pages as book " + otherBook.title + " hasn");
}

void compPublisher(Book otherBook) {
if (this.publisher.equals(otherBook.publisher))
System.out.println("The two books have the same Publisher: " +
this.publisher + 'n');
else
System.out.println("The two books DO NOT have the same Publisher" +
'n');

}

void compPubDate(Book otherBook) throws ParseException {
DateFormat df = new SimpleDateFormat("dd-MM-yyyy");

Date d1 = df.parse(this.pubdate);

Date d2 = df.parse(otherBook.pubdate);

String relation;

if (d1.equals(d2)) {
relation = " have the same publication date";
System.out.println("Book: " + this.title + " and " +
otherBook.title + "," + relation);
}
else if (d1.before(d2)) {
relation = " was published before Book: ";
System.out.println("Book: " + this.title + relation +
otherBook.title);
}
else {
relation = " was published after Book: ";
System.out.println("Book: " + this.title + relation +
otherBook.title);
}
}
}

public class Library {

public static void main(String[] arguments) {

Book book1 = new Book("Before The Dawn", "Tim Birtas", "MFA",
"GSGA", "23-3-2004", "030-536-278-9", 105, "Epic ltd");
Book book2 = new Book("A Brief History of Time", "Stephen W.
Hawking", "", "", "01-3-1988", "055-305-243-8", 198, "Bantam Books");
Book book3 = new Book("Teach Yourself C", "Herbert Schildt", "", "",
"01-4-2000", "960-512-228-6", 635, "McGraw-Hill");
Book book4 = new Book("Computer Networks", "Andrew S. Tanenbaum",
"", "GSGA", "23-3-2004", "0-13-394248-1", 813, "Prentice Hall");
Book book5 = new Book("Programming Languages II", "Cleanthis
Trabulides", "", "", "01-01-2001", "960-538-174-5", 252, "EAP");

book4.bookData(book4);

book2.compPages(book4);
book2.compPublisher(book4);
book2.compPubDate(book4);
}
}

Christophe Vanfleteren · Guest

Tim wrote:

Bryce (Work) · Guest

On 5 Apr 2004 07:55:25 -0700, [email]tbirtas (AT) mfa (DOT) gr[/email] (Tim) wrote:

Tim · Guest

Thank you both for the input! I think I got it now! Smile