Tester Class
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import java.util.*;
public class Tester {

	public static void studentOptions(Students users){
		Library lib=new Library();
        Scanner test=new Scanner(System.in);
        boolean leave = false;
        do {
                        System.out.println("Press 1 Check out");
                        System.out.println("Press 2: Return");
                        System.out.println("Press 3:Compare");
                        System.out.println("Press 4: Log out");

                        int choice =test.nextInt();
                        switch (choice) {
                        case 1:
                            lib.checkout(users);
                         break;
                        case 2:
                           users.returnBooks();
                            break;
                        case 3:
                            lib.compare_books();
                        	break;
                        case 4:
                            leave = true;
                            break;
                        }
                    } while (leave == false);
	}
        public static void adminOptions(){
        	Library lib=new Library();
            Scanner test=new Scanner(System.in);
            boolean leave = false;
            do {
                            System.out.println("Press 1 to list all students");
                            System.out.println("Press 2: To add a student");
                            System.out.println("Press 3: To remove a student");
                            System.out.println("Press 4: To search for a student");
                            System.out.println("Press 5: to add a book");
                            System.out.println("Press 6: to remove for a book");
                            System.out.println("Press 7: to search a book");
                            System.out.println("Press 8: Checkout a book");
                            System.out.println("Press 9: Return a book");
                            System.out.println("Press 10 to Compare Books");
                            System.out.println("Press 11: to Go to Menu");
                            int choice =test.nextInt();
                            switch (choice) {
                            case 1:
                                lib.liststudents();
                                 break;
                            case 2:
                                lib.add_students();
                                break;
                            case 3:
                                System.out.println("Enter Student Number: ");
                                Scanner scan=new Scanner(System.in);
                                int search= scan.nextInt();
                                lib.removestudents(search);
                                break;
                            case 4:
                                lib.search_students();
                                break;
                            case 5:
                                lib.add_books();
                                break;
                            case 6:
                            lib.remove_books();
                                break;
                            case 7:
                                lib.search_books();
                                break;
                            case 8:
                            	lib.checkout(null);
                            	break;
                            case 9:
                            	lib.getBookBack(null);
                            	break;
                            case 10:
                            	lib.compare_books();
                            case 11:
                                leave = true;
                                break;
                            }
                        } while (leave == false);
        }


        public static void main(String[] args) {
        	Students user = null;
        	Library lib=new Library();
            Scanner test=new Scanner(System.in);
            boolean loop = true;

            while(loop){
            	System.out.println("Bramalea Secondary School Library");
                System.out.println("Press 1: Student Login");
                System.out.println("Press 2: Admin Login");
                int x= test.nextInt();
                switch (x) {
                    case 1:
                    System.out.println("Enter student number: ");
                    int num = test.nextInt();
                    boolean isUser = false;
                    for (int counter = 0; counter < Library.students.size(); counter++){
                    	if (Library.students.get(counter).getstudentid() == num){
                    		isUser = true;
                    		break;
                    	}
                    }
                    if (isUser == true){
                    	user = lib.search_studentsPlus(num);
                        System.out.println("Hello, Student ");
                        studentOptions(user);
                    } else {
                    	System.out.println("Not Student");
                    }



                             break;
                    case 2:
                    	String password = "";
                    	boolean firstTime =false;
                    	do{
                    		if (firstTime == false){
                    			System.out.println("Status: Librarian");
                    			System.out.println("please enter your admin password: ");
                    			password=test.next();
                    			firstTime = true;
                    			adminOptions();
                    		} else {
                    			System.out.println("Incorrect the Password");
                    			System.out.println("please enter the password");
                    			password=test.next();
                    		}
                    	} while (!password.matches("admin"));
                }
            }

        }
        }

---------------------------------------------------------------------------------------------------------------------------------------Books Class
---------------------------------------------------------------------------------------------------------------------------------------
public class Books {

    private String title;
    private String author;
    private int ISBN;
    private String category;
    private double cost;
    private double rating;

        public Books (String titleofbook, String person, int ISBNnum, String genre, double costofbook, double starrating){
            title=titleofbook;
            author=person;
            ISBN= ISBNnum;
            category=genre;
            cost=costofbook;
            rating=starrating;
    }
        public String getAuthor() {
            return author;
        }
        public String getCategory() {
            return category;
        }
        public double getCost() {
            return cost;
        }
        public int getISBN() {
            return ISBN;
        }
        public double getrating() {
            return rating;
        }
        public String getTitle(){
            return title;
        }

}

---------------------------------------------------------------------------------------------------------------------------------------Library Class
---------------------------------------------------------------------------------------------------------------------------------------

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


public class Library {
    public ArrayList<Books> books=new ArrayList<Books>();
    public static ArrayList<Students> students=new ArrayList<Students>();

     public void add_students() {

     Scanner scan=new Scanner(System.in);

    System.out.println("How many students would you like to add: ");
    int numofstudents=scan.nextInt();
    for(int i=0;i<numofstudents;i++)
    {

       System.out.println("Enter first name");
        String firstname=scan.next();
        System.out.println("Enter last name");
        String lastname=scan.next();
        System.out.println("Enter student number");
        int studentNum=scan.nextInt();
        students.add((new Students(firstname, lastname, studentNum,0)));
        }
    }
    public void add_books() {

        Scanner scan=new Scanner(System.in);

    System.out.println("How many books would you like to add: ");
    int numofstudents=scan.nextInt();
    int m ;
    for(int i=0;i<numofstudents;i++)

    {
    	m = i+1;
        System.out.println("For the "+m+" book");
        scan.nextLine();
        System.out.println("Enter book's name");
        String bookname=scan.nextLine();
        System.out.println("Enter the Author's Name");
        String authorname=scan.nextLine();
        System.out.println("Enter the ISBN number");
        int ISBN=scan.nextInt();
        scan.nextLine();
        System.out.println("Please Enter the Genre of the book");
        String category=scan.nextLine();
        System.out.println("Please Enter the cost of the book");
        double cost=scan.nextDouble();
        System.out.println("Please Enter the Rating of the the book");
        double rating =scan.nextDouble();
        books.add((new Books(bookname, authorname, ISBN,category,cost, rating )));
        }
    }
    public void search_books() {
    	{
        Scanner scan=new Scanner(System.in);
        System.out.println("Enter the ISBN of the book");
        int search= scan.nextInt();
        for(int i = 0;i<books.size();i++){
            if (books.get(i).getISBN()==search)
            {
                System.out.println("Title: "+books.get(i).getTitle());
                System.out.println("Author Name: "+books.get(i).getAuthor());
                System.out.println("Genre: "+books.get(i).getCategory());
                System.out.println("Cost: "+books.get(i).getCost());
                System.out.println("ISBN: "+books.get(i).getISBN());
                System.out.println("Stars: "+books.get(i).getrating());
                System.out.println("\n");
            }


        }
    }
    }
    public void liststudents(){
    	System.out.println("Student List");
    	System.out.println("______________________________");
    	System.out.println(" ");
    	for(Students x : students){
    		System.out.println("First Name: "+x.getfirstname());
    		System.out.println("Last Name "+x.getlastname());
    		System.out.println("Student Number: "+x.getstudentid());
    		System.out.println("Student Fines: "+x.getstudentfines());
    		System.out.println("\n");;
    	}
    }
    public void compare_books(){
    	Scanner scan=new Scanner(System.in);
    	System.out.println("Enter the ISBN of the first book");
    	int searchkey= scan.nextInt();
    	System.out.println("Enter the ISBN of the second");
    	int searchkey2=scan.nextInt();
    	for(int i = 0;i<books.size();i++){
    	       if (books.get(i).getISBN()==searchkey)
    	       {

    	System.out.println("Title: "+books.get(i).getTitle());
    	System.out.println("Author: "+books.get(i).getAuthor());
    	System.out.println("Category: "+books.get(i).getCategory());
    	System.out.println("Cost(in CAD): "+books.get(i).getCost());
    	System.out.println("ISBN: "+books.get(i).getISBN());
    	System.out.println("Star rating"+books.get(i).getrating());
    	       }
    	   for(int j = 0;i<books.size();j++)
    	if (books.get(i).getISBN()==searchkey2)
    	       {
    	System.out.println("Title: "+books.get(i).getTitle());
    	System.out.println("Author: "+books.get(i).getAuthor());
    	System.out.println("Category: "+books.get(i).getCategory());
    	System.out.println("Cost(in CAD): "+books.get(i).getCost());
    	System.out.println("ISBN: "+books.get(i).getISBN());

    	System.out.println("Star rating"+books.get(i).getrating());

    	       }

    	   }
    	   }
    public void listbooks(){
    	System.out.println("Book List");
    	for(Books y: books){
    		System.out.println("Title of the Book: "+y.getTitle());
    		System.out.println("Author of the book: "+y.getAuthor());
    		System.out.println("Genre of the Book"+y.getCategory());
    		System.out.println("Cost of the book"+y.getCost());
    		System.out.println("Rating of the book"+y.getrating());
    		System.out.println("ISBN of the book: "+y.getISBN());
    		System.out.println("\n");
    	}
    }
    public void removestudents(int num) {

        Scanner scan=new Scanner(System.in);
        for(int u = 0;u<students.size();u++){
            if (students.get(u).getstudentid() == num)
            {
            	students.remove(u);
        }

        }
}
		public void remove_books(){
	        Scanner scan=new Scanner(System.in);
	        System.out.println("Enter the ISBN of the book");
	        int isbnsearch= scan.nextInt();
	        for(int i = 0;i<books.size();i++){
	            if (books.get(i).getISBN()==isbnsearch)
	            {
	                System.out.println("Title: "+books.get(i).getTitle());
	                System.out.println("Author: "+books.get(i).getAuthor());
	                System.out.println("Genre: "+books.get(i).getCategory());
	                System.out.println("Cost of book: "+books.get(i).getCost());
	                System.out.println("Get Book ISBN: "+books.get(i).getISBN());
	                System.out.println("Book Rating: "+books.get(i).getrating());
	                System.out.println("Are you sure you want to remove this book? (Y)es/(N)o");
	                String yes=scan.next();
	                yes.toLowerCase();
	                if(yes.matches("y")){
	                    books.remove(i);
	                    System.out.println("This book has been Removed");
	            }
	                else{
	                    System.out.println("This book has not been Removed");
	                }
	            }
	        }
	}
		public void search_students() {
	    	{
	        Scanner scan=new Scanner(System.in);
	        System.out.println("Enter	 the Student Number: ");
	        int search= scan.nextInt();
	        for(int i = 0;i<students.size();i++){
	            if (students.get(i).getstudentid()==search)
	            {
	                System.out.println("First Name: "+students.get(i).getfirstname());
	                System.out.println("Last Name: "+students.get(i).getlastname());
	                System.out.println("Student ID: "+students.get(i).getstudentid());
	                System.out.println("OutStanding Fines:  "+students.get(i).getstudentfines());
	                System.out.println();
	                System.out.println("\n");
	            }
	        }
	    	}
		}

		public Students search_studentsPlus(int num) {
			Students s = null;
            for(int i = 0;i<students.size();i++){
                if (students.get(i).getstudentid()==num)
                {
                    s = students.get(i);
                }
            }
            return(s);
	    	}

		public void checkout(Students user) {
			Scanner input = new Scanner(System.in);
            int index = 0;

            System.out.println("Please Enter the ISBN of the book");
            int search = input.nextInt();
            for(int i1 = 0;i1<books.size();i1++){
                if (books.get(i1).getISBN()==search)
                {
                    index = i1;
                    user.checkOut(books.get(i1));
                    user.displayBooks();
                    break;
                }

            }
            books.remove(index);
		}
		public void getBookBack (Books b){
			books.add(b);
		}

}

---------------------------------------------------------------------------------------------------------------------------------------Students Class
---------------------------------------------------------------------------------------------------------------------------------------
import java.util.ArrayList;
import java.util.Scanner;

public class Students extends Library {

    private String firstname;
    private String lastname;
    private int studentid;
    private double studentfines;
    private ArrayList<Books> books = new ArrayList<Books>();

    public Students(String firstnam, String lastnam, int id,double fines)
    {
        firstname=firstnam;
        lastname=lastnam;
        studentid=id;
        studentfines=fines;
    }
    public String getfirstname() {
        return firstname;
    }
    public String getlastname() {
        return lastname;
    }
    public int getstudentid() {
        return studentid;
    }
    public double getstudentfines() {
        return studentfines;
    }
    public void checkOut(Books book){
    	books.add(book);
    }
    public void returnBooks(){
    	Library lib=new Library();
    	 Scanner input=new Scanner(System.in);
    	for(int i = 0; i < books.size(); i++){
    		System.out.println("Press (" + i + ") to return: " + books.get(i).getTitle() + " by " + books.get(i).getAuthor());
    		}
    		int choice = input.nextInt();
    		lib.getBookBack(books.get(choice));
    		books.remove(choice);
    }

    public void displayBooks(){
    	System.out.println(firstname + lastname + "Student ID:  " + studentid + " has: ");
    	for(Books x : books){
    		System.out.print(x.getTitle() + "\n");
    	}
    }


}