BookList.java

import java.util.*;
/**
 * Write a description of class BookList here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class BookList
{
    // instance variables - replace the example below with your own;
    private String[] books = new String[10];
    
    /**
     * Constructor for objects of class BookList
     */
    public BookList()
    {
         books = new String[10];
    }

    /**
     * Array of the 10 books available that users can rent
     * 
     */
    public String[] books()
    {
        String[] books = new String[10];
         
        books[0] = "Learn Java for Dummies,John Smith";
        books[1] = "Learn JavaScript in 10 Minutes,Jack Arnold";
        books[2] = "Learn IOS,Edgar Alan Poe";
        books[3] = "Learn SQL,James Rodriguez";
        books[4] = "Learning .Net is not boring,Hungry Jack";
        books[5] = "Shine while learing Ruby,Britney Spears";
        books[6] = "Move like a snake with Phython";
        books[7] = "Learn PHP and work in Facebook,Bill Gates";
        books[8] = "Learn C only if you are smart, Goofy";
        books[9] = "Learn C++ in a year++, Atreyu";
        
        return books;
    }
    
    public void displayAllBooks()
    {
        String[] displayBooks = books();
        
        for (int count = 0; count < displayBooks.length; count++)
            System.out.println((count + 1) + ") " +displayBooks[count]);
    }
    
    public String getBook(int thisBook)
    {
        String[] getBook = books();
        return getBook[thisBook];
    }
}

Library.java

import java.util.*;
/**
 * Write a description of class Library here.
 * 
 * @author Daniel Toro
 * @student 27045382
 * @version May/2016
 */
public class Library
{
    // instance variables - replace the example below with your own
    private String borrowerMenu;
    private String mainMenu;
    private int userSelected;
    private UserList userListLibrary;
    private BookList bookListLibrary;
    
    /**
     * Constructor for objects of class Library
     */
    public Library()
    {
        mainMenu = "";
        borrowerMenu = "";
        userSelected = 0;
        userListLibrary = new UserList();
        bookListLibrary = new BookList();
    }
    
    /** 
     * This method display the borrower menu of the library with the options available. 
     * Every option is attached to one functionality of the borrower's menu, therefore to other methods.  
     */
    
    public void displayBorrowerMenu()
    {
        System.out.println("Manage Borrowers Menu");
        System.out.println("======================================");
        
        // Start new game
        System.out.println("(1) Borrow a book");
        System.out.println("(2) Return a book");
        System.out.println("(3) List borrowed books");
        System.out.println("(4) Return to main menu");
        System.out.println("------------------------");
        System.out.println("Choose an option:");
    }
    
    /**
     * Display the library help guide and describes the function of each option in the Library menu.
     * This method correspond to the Option 4 of the mainMenu field.
     */
    public void displayHelp()
    {
        System.out.println("Option 1: If you select this options the game will start.");
        System.out.println("          The game consists in two players rolling dice until one of them reaches the maximum scored that is set at the begining of the game by the same players");
        System.out.println("Option 2: This option will roll the dices for both players and gives you the sum of each score for this round");
        System.out.println("Option 3: This option will gives the score of each player and will show who is leading the game");
        System.out.println("Option 4: Will takes you to this help guide!");
        System.out.println("Option 5: When you press '5' this will quit the game.");
        System.out.println("");
    }
    
    /** 
     * This method display the menu of the library with the options available. 
     * Every option is attached to one functionality of the library, therefore to other methods.  
     */
    
    public void displayMainMenu()
    {
        System.out.println("Welcome to My Library!");
        System.out.println("======================================");
        
        // Start new game
        System.out.println("(1) Register New Borrower");
        System.out.println("(2) Manage Borrowers");
        System.out.println("(3) List All Borrowers");
        System.out.println("(4) Display help");
        System.out.println("(5) Exit Library");
        System.out.println("------------------------");
        System.out.println("Choose an option:");
    }
    
    /**
     * It will return the actual value of the main menu that is selected at the moment of it is called.
     */
    public String getMainMenuChoice()
    {
        return mainMenu;
    }
    
    /**
     * It will return the actual value of the borrower menu that is selected at the moment of it is called.
     */
    public String getBorrowerMenuChoice()
    {
        return borrowerMenu;
    }
    
    /**
     * It will return the actual value of userSelected field.
     */
    public int getUserSelected()
    {
        return userSelected;
    }
    
    public void rentBook() // CHECK THIS METHOD!!
    {
        int bookSelected = 0;
       
        Scanner console = new Scanner(System.in);
        System.out.println("These are the available books to rent: ");
        System.out.println("========================================");
        bookListLibrary.displayAllBooks();
        System.out.println("");
        System.out.println("Please select the book the user would like to rent: ");
        try
        {
            bookSelected = console.nextInt();
            if ((bookSelected - 1) < bookListLibrary.books().length && bookSelected > 0)
                userListLibrary.assignBook((getUserSelected()), bookListLibrary.getBook(bookSelected - 1));
            else
                System.out.println("Please select one of the available books");
        }
        catch (InputMismatchException noInteger)
        {
            System.out.println("Please enter a number");
            System.out.println("");
        }
    }
    
    public void returnBook()
    {
        int bookSelected;
        
        Scanner console = new Scanner (System.in);
        System.out.println("These are the books available to return:");
        System.out.println("========================================");
        userListLibrary.displayBorrowedBooks(getUserSelected());
        System.out.println("Please select the book the user would like to return: ");
        try
        {
            bookSelected = console.nextInt();
            userListLibrary.removeBook(getUserSelected(), bookListLibrary.getBook(bookSelected -1));
        }
        catch (Exception noInteger)
        {
            System.out.println("");
            System.out.println("Please enter a number");
            System.out.println("");
            console.nextLine();
        }
    }
    
    /**
     * Runs the Borrower Menu through a switch statement. 
     * Each case of the switch statement corresponds to one option of the functionality of the Borrower Menu.
     */
    public void startBorrowerMenu()
    {
        selectUserManage(); // User select what borrower will manage
        
        do {
            displayBorrowerMenu();
            setBorrowerMenuChoice();
            switch(borrowerMenu)
            {
                 case "1":
                        rentBook();
                        break;

                 case "2":
                        returnBook();
                        break;
                     
                 case "3": 
                        userListLibrary.displayBorrowedBooks(getUserSelected());
                        break;
                       
                 default:
                        if(getBorrowerMenuChoice().equals("4"))
                        {
                            setUserSelected(0);
                        } //return to previus menu
                        else
                        {
                            System.out.println("Please select an option from the menu. (1 to 4)");
                            System.out.println("");
                        }
                    
            }
        }
        while (!getBorrowerMenuChoice().equals("4"));
    }
    
    /**
     * Runs the they main Library menu through a switch statement. Each case of the switch statement corresponds to one option of the main Library Menu.
     */
    public void startLibrary()
    {
        userListLibrary.readFile();
        String mainMenuChoice;
        do {
            displayMainMenu();
            setMainMenuChoice();
            
            switch(mainMenu)
            {
                case "1":
                        userListLibrary.addNewUser();
                        break;

                 case "2":
                       startBorrowerMenu(); 
                       break;
                     
                 case "3":
                       userListLibrary.displayBorrowers();
                       break;
                     
                 case "4":
                       displayHelp();
                       break;
                       
                 default:
                       if(getMainMenuChoice().equals("5"))
                       {
                            userListLibrary.writeFile();
                            System.out.println("Thanks visiting My Library!");
                       }
                       else
                       {
                           System.out.println("Please select an option from the menu. (1 to 5)");
                           System.out.println("");
                       }
            }
        }
        while (!getMainMenuChoice().equals("5"));
    } 
    
    
    /**
     * Method selectUserManage
     *
     */
    public void selectUserManage()
    {
        int thisUser;
        Scanner console = new Scanner(System.in);
        
        try
        {
            System.out.println("These are the Users registered");
            userListLibrary.displayManageBorrowers();
            System.out.println("Please select the user you would like to manage it's books rentals");
            thisUser = console.nextInt();
            if ((thisUser -1) < userListLibrary.returnSize() && thisUser > 0)
                setUserSelected(thisUser);    
            else
            {
                System.out.println("ERROR: Please try again and select one of the available users");
                selectUserManage();
            }
        }
        catch (Exception noInteger)
        {
            System.out.println("Please enter a number:");
            System.out.println("");
            selectUserManage();
        }
    }
    
    /**
     * This method assignates a value to the option of the manage borrowers menu. It will activate one of the options in the displayBorrowerMenu method.
     */
    public void setBorrowerMenuChoice()
    {
        String borrowerMenuChoice;
        Scanner console = new Scanner (System.in);
        borrowerMenuChoice = console.nextLine();
        borrowerMenu = borrowerMenuChoice;
    }
    
    /**
     * This method assignates a value to the option of the menu. It will activate one of the options in the displayMainMenu method.
     */
    public void setMainMenuChoice()
    {
        String mainMenuChoice;
        Scanner console = new Scanner (System.in);
        mainMenuChoice = console.nextLine();
        mainMenu = mainMenuChoice;
    }
    
     /**
     * This method assignates a value to the option of the menu. It will activate one of the options in the displayMainMenu method.
     */
    public void setUserSelected(int newUserSelected)
    {
        userSelected = newUserSelected - 1;
    }
}

User.java

import java.util.*;

/**
 * User class will handle all the basic information about the users or borrowers of the book.
 * This server class will provide the information to the UserList class.
 * 
 * @author Daniel Toro
 * @version (a version number or a date)
 */
public class User
{
    private String name;
    private int id;
    private int age;
    private String[] rentedBooks; // create 2 methods to add and remove from array

    /**
     * Default Constructor for objects of class User
     */
    public User()
    {
        name = "";
        id = 0;
        age = 0;
        rentedBooks = new String[2];
    }

    /**
     * Accesor method that will return the age of the object of User's class
     * 
     * @return     age
     */
    public int getAge()
    {
        return age;
    }
    
    public void addBook(int index, String newBook)
    {
        rentedBooks[index] = newBook;
    }
    
    public String getBook(int index)
    {
        return rentedBooks[index];
    }
    
    public void removeBook(int index)
    {
        rentedBooks[index] = null;
    }
    
    /**
     * Accesor method that will return the id of the object of User's class
     * 
     * @return     id
     */
    public int getId()
    {
        return id;
    }
    
    /**
     * Accessor method that will return the name of the object of User's class
     * 
     * @return     name
     */
    public String getName()
    {
        return name;
    }
    
    /**
     * Mutator method that will set the age of the object of User's class
     */
    public void setAge(int newAge)
    {
        age = newAge;
    }
    
    /**
     * Mutator method that will set the id of the object of User's class
     */
    public void setId(int newId)
    {
        id = newId;
    }
    
    /**
     * Mutator method that will set the name of the object of User's class
     */
    public void setName(String newName)
    {
        name = newName;
    }
}

UserList.java

import java.io.*;
import java.util.*;

/**
 * Write a description of class UserList here.
 * 
 * @author Daniel Toro
 * @student 27045382
 * @version May/2016
 */
public class UserList
{
    private ArrayList<User> userList;
    private User newUser;
    private User countUsers;
    private String filename = "borrowers.txt";
    
    /**
     * Constructor for objects of class UserList
     */
    public UserList()
    {
        userList = new ArrayList<User>();
        newUser = new User();
        countUsers = new User();
    }
    
    public void addNewUser()
    {   
        User newUser = new User();
        
        String newName;
        int newAge = 0;
        int newId = 0;
        String emptyBookOne = "";
        String emptyBookTwo = "";
        boolean idAlreadyExist = false;
        
        Scanner console = new Scanner(System.in);
        
        while (newUser.getName().isEmpty() || !newUser.getName().matches("a-zA-Z_\\s")) 
        {
            System.out.println("Please enter the name of new user: ");
            newName = console.nextLine();
            if(!newName.isEmpty()) 
            {
                newUser.setName(newName);
                break;
            }
            else
                System.out.println("Name can't be empty or can't be numbers or characters");
        }
        
        while (newAge < 5 || newAge > 110) 
        {
            System.out.println("Please enter age of new user");
            try 
            {
                newAge = console.nextInt();
            }
            catch (Exception noInteger)
            {
                System.out.println("Enter a number for the Age of the user");
                System.out.println("");
                console.nextLine();
            }
            
            if (newAge >= 5 && newAge <= 110) {newUser.setAge(newAge);}
            else{System.out.println("User Age must be between 5 and 110");}
        }
        
        while (newId < 1 || newId > 100 || idAlreadyExist == true)
        {
            idAlreadyExist = false;
            System.out.println("Please enter ID of new user");
            try
            {
                newId = console.nextInt();
                // Check if the ID is between the established limits.
                if (newId > 0 && newId <= 100) 
                    newUser.setId(newId);
                else{System.out.println("User ID must be between 1 and 100");}
                
                // Search if the ID already exists
                for (int count = 0; count < userList.size(); count++) 
                {
                    countUsers = userList.get(count);
                    if (countUsers.getId() == newId)
                        idAlreadyExist = true;
                }  
                // print error if Id already exists
                if (idAlreadyExist == false)
                    newUser.setId(newId);
                else
                {
                    System.out.println("ID already exists. Please try with other ID");
                    idAlreadyExist = true;
                }
            }
            catch (Exception noInteger)
            {
                System.out.println("Enter a number for the ID of the user. Please try again.");
                System.out.println("");
                break;
            }
        }
        
        userList.add(newUser);
    }
    
    public void assignBook(int thisUser, String thisBook)
    {
        countUsers = userList.get(thisUser);
        if (countUsers.getBook(0) == null)
            countUsers.addBook(0,thisBook);
        else if (countUsers.getBook(1) == null)
            countUsers.addBook(1,thisBook);
        else if (!countUsers.getBook(0).isEmpty() &&  !countUsers.getBook(1).isEmpty())
            System.out.println("User can only rent two books. Please return one book to rent a new one");
    }

    public void displayBorrowers()
    {
        System.out.println("inside displayBorrowers method, userList size is: " + userList.size());
        for (int count = 0; count < userList.size(); count++)
        {
            countUsers = userList.get(count);
            System.out.println("Name: " + countUsers.getName());
            System.out.println("Age: " + countUsers.getAge());
            System.out.println("ID: " + countUsers.getId());
            if(countUsers.getBook(0) != null)
                System.out.println("Book 1: " + countUsers.getBook(0));
            
            if(countUsers.getBook(1) != null)
                System.out.println("Book 2: " + countUsers.getBook(1));
            System.out.println("");
        }
    }
    
    public void displayBorrowedBooks(int thisUser)
    {
        countUsers = userList.get(thisUser);
        if(countUsers.getBook(0) == null && countUsers.getBook(1) == null)
            System.out.println("This user have not rented any book");
        else if(countUsers.getBook(0) != null && countUsers.getBook(1) == null)
            System.out.println("1) " + countUsers.getBook(0));
        else if(countUsers.getBook(0).isEmpty() && !countUsers.getBook(1).isEmpty())
            System.out.println("1) " + countUsers.getBook(1));
        else if(!countUsers.getBook(0).isEmpty() && !countUsers.getBook(1).isEmpty())
        {
            System.out.println("1) " + countUsers.getBook(0));
            System.out.println("2) " + countUsers.getBook(1));
        }
        System.out.println("");
    }
    
    public void displayManageBorrowers()
    {
        for(int count = 0; count < userList.size(); count++)
        {
            countUsers = userList.get(count);
            System.out.println((count + 1 ) + ") " + countUsers.getName());
        }
    }
    
    public void writeFile()
    {
        try
        {
            String filename = "borrowers.txt";
            PrintWriter outputFile = new PrintWriter(filename);
                 for(int count = 0; count < userList.size(); count++)
                 {
                     countUsers = userList.get(count);
                     if (countUsers.getBook(0) == null && countUsers.getBook(1) == null)
                        outputFile.println(countUsers.getName() + "," + countUsers.getId() + "," + countUsers.getAge());
                     else if (countUsers.getBook(0) != null && countUsers.getBook(1) == null)
                        outputFile.println(countUsers.getName() + "," + countUsers.getId() + "," + countUsers.getAge() + "," + countUsers.getBook(0));
                     else if (countUsers.getBook(0) == null && countUsers.getBook(1) != null)
                        outputFile.println(countUsers.getName() + "," + countUsers.getId() + "," + countUsers.getAge() + "," + countUsers.getBook(1));
                     else if (countUsers.getBook(0) != null && countUsers.getBook(1) != null)
                        outputFile.println(countUsers.getName() + "," + countUsers.getId() + "," + countUsers.getAge() + "," + countUsers.getBook(0) + "," + countUsers.getBook(1));
                 }
            outputFile.close();
        }
        catch (IOException e)
        {
            System.out.println("Somethig went wrong with accessing the file");
        }
    }
    
    public void readFile()
    {
        try 
        {   
            String filename = "borrowers.txt";
            FileReader inputFile = new FileReader(filename);
            Scanner parser = new Scanner(inputFile);
            while (parser.hasNextLine()){
                User newUser = new User();
                
                String readLine = parser.nextLine();
                String [] userDetails = readLine.split(",");
               
                String userName = userDetails[0];
                newUser.setName(userName);
                
                String userId = userDetails[1];
                newUser.setId(Integer.parseInt(userId));
                
                String userAge = userDetails[2];
                newUser.setAge(Integer.parseInt(userAge));
                
                if(userDetails.length > 5)
                {
                    String userBookOne = userDetails[3];
                    String userAuthorOne = userDetails[4];
                    newUser.addBook(0,(userBookOne + "," + userAuthorOne));
                    
                    String userBookTwo = userDetails[5];
                    String userAuthorTwo = userDetails[6];
                    newUser.addBook(1,(userBookTwo + "," + userAuthorTwo));
                }
                else if (userDetails.length > 3)
                {
                    String userBookOne = userDetails[3];
                    String userAuthorOne = userDetails[4];
                    newUser.addBook(0,(userBookOne + "," + userAuthorOne));
                }
                userList.add(newUser);
            }
            inputFile.close();
        }
        catch (IOException ioException)
        {
            System.out.println("Unexpected I/O error occured");
        }
    }
   
    public void removeBook(int thisUser, String thisBook) //CHECK THIS METHOD!!
    {
        countUsers = userList.get(thisUser);
        if (countUsers.getBook(0).equals(thisBook))
            countUsers.removeBook(0);
        else if (countUsers.getBook(1).equals(thisBook))
            countUsers.removeBook(1);
        else if (countUsers.getBook(0) == null && countUsers.getBook(1) == null)
           System.out.println("You have no books to return");
    }
   
    public int returnSize()
    {
        int size;
        size = userList.size();
        return size;
    }
}