public class Book $\{$

private int id;

private String title;

private String author;

$//$ Constructor

public Book$($int id$,$ String title, String author$)\{$

this.id $=$ id;

this.title $=$ title;

this.author $=$ author;

$\}$

$//$ Getters

public int getId$()\{$

return id;

$\}$

public String getTitle$()\{$

return title;

$\}$

public String getAuthor$()\{$

return author;

$\}$

$//$ toString method to represent the book as a string

@Override

public String toString$()\{$

return id $+"."+$ title $+","+$ author;

$\}$

$\}$

import java.util.ArrayList;

import java.util.List;

public class Library $\{$

private List books;

$//$ Constructor

public Library$()\{$

this.books $=$ new ArrayList$<>()$;

$\}$

$//$ Method to add a book to the library

public void addBook$($Book book$)\{$

books.add$($book$)$;

$\}$

$//$ Method to remove a book from the library using its ID

public void removeBook$($int id$)\{$

for $($Book book : books$)\{$

if $($book$.$getId$()==$ id$)\{$

books.remove$($book$)$;

return;

$\}$

$\}$

$\}$

$//$ Method to list all books in the library

public void listBooks$()\{$

for $($Book book : books$)\{$

System.out.println$($book$)$;

$\}$

$\}$

$\}$

import java.io$.$File;

import java.io$.$FileNotFoundException;

import java.util.Scanner;

public class Main $\{$

public static void main$($String$[]$ args$)\{$

Library library $=$ new Library$()$;

$//$ Read books from the text file and add them to the library

try $\{$

File file $=$ new File$("$books$.$txt$")$;

Scanner scanner $=$ new Scanner$($file$)$;

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

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

String$[]$ parts $=$ line.split$(",")$;

int id $=$ Integer.parseInt$($parts$[0])$;

String title $=$ parts$[1]$;

String author $=$ parts$[2]$;

Book book $=$ new Book$($id$,$ title, author$)$;

library.addBook$($book$)$;

$\}$

scanner.close$()$;

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

System.out.println$("$File not found."$)$;

$\}$

Scanner input $=$ new Scanner$($System$.$in$)$;

int choice;

do $\{$

System.out.println$("$Library Management System"$)$;

System.out.println$("1.$ Add a book"$)$;

System.out.println$("2.$ Remove a book"$)$;

System.out.println$("3.$ List all books"$)$;

System.out.println$("0.$ Exit"$)$;

System.out.print$("$Enter your choice: $")$;

choice $=$ input.nextInt$()$;

switch $($choice$)\{$

case $1$:

System.out.print$("$Enter book ID: $")$;

int id $=$ input.nextInt$()$;

input.nextLine$()$; $//$ Consume newline

System.out.print$("$Enter book title: $")$;

String title $=$ input.nextLine$()$;

System.out.print$("$Enter book author: $")$;

String author $=$ input.nextLine$()$;

Book newBook $=$ new Book$($id$,$ title, author$)$;

library.addBook$($newBook$)$;

System.out.println$("$Book added successfully."$)$;

break;

case $2$:

System.out.print$("$Enter book ID to remove: $")$;

int removeId $=$ input.nextInt$()$;

library.removeBook$($removeId$)$;

System.out.println$("$Book removed successfully."$)$;

break;

case $3$:

System.out.println$("$List of all books:"$)$;

library.listBooks$()$;

break;

case $0$:

System.out.println$("$Exiting$...")$;

break;

default:

System.out.println$("$Invalid choice. Please enter a valid option."$)$;

break;

$\}$

$\}$ while $($choice $!=0)$;

input.close$()$;

$\}$

$\}$

least $5$: adding a book, removing a book, checking in a book, checking out a book, and displaying the contents of the database. And, each of the use case$/$user stories need to have a UML diagram.