Need to create public bollean checkin methods and test them.

public boolean checkin $($long isbn$)$

public boolean checkin$($String holder$)$

Given the following codes:

import java.io$.$File;

import java.io$.$FileNotFoundException;

import java.util.ArrayList;

import java.util.GregorianCalendar;

import java.text.ParseException;

import java.util.Scanner;

$/*$ Class representation of a library $($a collection of library books$).*/$

public class Library $\{$

private ArrayList library;

private ArrayList libraryList;

public Library$()\{$

library $=$ new ArrayList$()$;

$\}$

$/*$ Add the specified book to the library, assume no duplicates.$*/$

public void add$($long isbn, String author, String title$)\{$

library.add$($new LibraryBook$($isbn$,$ author, title$))$;

$\}$

$/*$ Add the list of library books to the library, assume no duplicates.$*/$

public void addAll$($ArrayList list$)\{$

library.addAll$($list$)$;

$\}$

$/*$ Add books specified by the input file. One book per line with ISBN, author,

$*$ and title separated by tabs$.$ If file does not exist or format is violated, do nothing.$*/$

public void addAll$($String filename$)\{$

ArrayList toBeAdded $=$ new ArrayList$()$;

try $\{$

Scanner fileIn $=$ new Scanner$($new File$($filename$))$;

int lineNum $=1$;

while $($fileIn$.$hasNextLine$())\{$

String line $=$ fileIn.nextLine$()$;

Scanner lineIn $=$ new Scanner$($line$)$;

lineIn.useDelimiter$("\backslash \backslash$t$")$;

if $(!$lineIn.hasNextLong$())$

throw new ParseException$("$ISBN$",$ lineNum$)$;

long isbn $=$ lineIn.nextLong$()$;

if $(!$lineIn.hasNext$())$

throw new ParseException$("$Author$",$ lineNum$)$;

String author $=$ lineIn.next$()$;

if $(!$lineIn.hasNext$())$

throw new ParseException$("$Title$",$ lineNum$)$;

String title $=$ lineIn.next$()$;

toBeAdded.add$($new LibraryBook$($isbn$,$ author, title$))$;

lineNum$++$;

$\}$

$\}$ catch $($FileNotFoundException e$)\{$

System.err.println$($e$.$getMessage$()+"$ Nothing added to the library."$)$;

return;

$\}$ catch $($ParseException e$)\{$

System.err.println$($e$.$getLocalizedMessage$()$

$+"$ formatted incorrectly at line $"+$ e$.$getErrorOffset$()$

$+".$ Nothing added to the library."$)$;

return;

$\}$

library.addAll$($toBeAdded$)$;

$\}$

$/*$ Returns the holder of the library book with the specified ISBN.

$*$ If no book with the specified ISBN is in the library, returns null. $*/$

public String lookup$($long isbn$)\{$

int index $=0$;

boolean find$\_$Holdder$\_$flag $=$ false;

return null; $//$place holder

$\}$

public boolean checkout$($long isbn, String holder, int month, int day, int year$)\{$

boolean checkout$\_$flag $=$ false;

return checkout$\_$flag;

$\}$

$/***$ Returns the list of library books checked out to the specified holder.

$*$ If the specified holder has no books checked out, returns an empty list.

$*$ holder whose checked out books are returned $*/$

public ArrayList lookup$($String holder$)\{$

return null; $//$placeholder

$\}$

$/*$ IISBN of the library book to be checked in $*/$

public boolean checkin$($long isbn$)\{$

int index $=0$;

if $($library$.$size$()>0)\{$

for $($index $=0$; index $<$ library.size$()$; index$++)\{$

if $($library$.$get$($index$).$getIsbn$()==$ isbn$)$

$\{$

return true;

$\}$

$\}//$ end of for loop

$\}$

return false; $//$ placeholder

$\}$

$/*$ holder of the library books to be checked in$*/$

public boolean checkin$($String holder$)\{$

int index $=0$;

if $($library$.$size$()>0)\{$

for $($index $=0$; index $<$ library.size$()$; index$++)\{$

if $($library$.$get$($index$).$getHolder$()==$ holder$)$

$\{$

return true;

$\}$

$\}//$ end of for loop

$\}$

return false; $//$ placeholder

$\}$

$\}$