Can't get bubble sort to work w/ comparing object properties

Can't get bubble sort to work w/ comparing object properties

For an array of books, the assignment is to get attributes of the objects
from the user, then sort based on their choice of author, title, or page
count. My bubble sort is working for the page count but not when the user
chooses author or title, so I'm guessing I'm missing something with
reference storage vs. value storage, maybe? Thanks!
import javax.swing.*;
import java.util.*;
public class LibraryBookSort {
public static void main(String[] args) {
LibraryBook[] books = new LibraryBook[5];
LibraryBook tempBook = new LibraryBook();
String enteredAuthor = "", enteredTitle = "";
String enteredPageCount;
String sortBy;
String displayString = "";
int parsedSortBy;
int parsedPageCount;
int booksLength = books.length;
// populate the array
for (int x = 0; x < booksLength; ++x)
books[x] = new LibraryBook();
// get property values from user
for (int x = 0; x < booksLength; ++x)
{
enteredTitle = JOptionPane.showInputDialog(null, "Enter book " +
(x + 1) + " of 5's title:");
books[x].setTitle(enteredTitle);
enteredAuthor = JOptionPane.showInputDialog(null, "Enter book " +
(x + 1) + " of 5's author:");
books[x].setAuthor(enteredAuthor);
enteredPageCount = JOptionPane.showInputDialog(null, "Enter book "
+ (x + 1) + " of 5's page count:");
parsedPageCount = Integer.parseInt(enteredPageCount);
books[x].setPageCount(parsedPageCount);
}
// sort by property values
sortBy = JOptionPane.showInputDialog("Choose option to sort by: (1)
title, (2) author, or (3) page count");
parsedSortBy = Integer.parseInt(sortBy);
while (parsedSortBy < 1 || parsedSortBy > 3)
{
sortBy = JOptionPane.showInputDialog("Invalid selection, please
choose option to sort by: (1) title, (2) author, or (3) page
count");
parsedSortBy = Integer.parseInt(sortBy);
}
if (parsedSortBy == 1)
{
for (int a = 0; a < booksLength - 1; ++a)
{
for (int b = 0; b < booksLength - 1; ++b)
{
if (books[b].getTitle().compareTo(books[b+1].getTitle()) > 1)
{
tempBook = books[b];
books[b] = books[b+1];
books[b+1] = tempBook;
}
}
}
}
else if (parsedSortBy == 2)
{
for (int a = 0; a < booksLength - 1; ++a)
{
for (int b = 0; b < booksLength - 1; ++b)
{
if (books[b].getAuthor().compareTo(books[b+1].getAuthor())
> 1)
{
tempBook = books[b];
books[b] = books[b+1];
books[b+1] = tempBook;
}
}
}
}
else
{
for (int a = 0; a < booksLength - 1; ++a)
{
for (int b = 0; b < booksLength - 1; ++b)
{
if (books[b].getPageCount() > books[b+1].getPageCount())
{
tempBook = books[b];
books[b] = books[b+1];
books[b+1] = tempBook;
}
}
}
}
for (int i = 0; i < booksLength; ++i)
{
displayString += (books[i].getTitle() + ", by " +
books[i].getAuthor() + ". " + books[i].getPageCount() + "
pages.\n");
}
JOptionPane.showMessageDialog(null, "Books sorted by your choice:\n\n"
+ displayString);
}
}