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Thread: Can anyone give me help/advice on this java library program?

  1. #1
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    Default Can anyone give me help/advice on this java library program?

    Hey everyone and thanks for taking the time to read my 1st post. Quite new to java and would appreciate if anyone could help me out with the following problems in my program. I am designing a program for a small classroom library. The code is below. The main application menu class, a loanBook class and a pupil helper class. Whats confusing me is trying to create and link up the the menu options of display available books, borrow book, and loan book. I have included the code and hope that some of you can give me any advice to help me. Thanks in advance.

    public class bookArray
    {
        static Scanner keyboard = new Scanner(System.in);
     
        loanBook [] bookArray = new loanBook[5];
        static String title, author, status;
     
        public void addBook ()
        {
            for (int count=0; count<bookArray.length; count++)
            {
                System.out.println("Please enter the book title :\t");
                title = keyboard.nextLine();
                System.out.println("Please enter the book author :\t");
                author = keyboard.nextLine();
                status = "Available";
     
                bookArray[count] = new loanBook(title, author);
            }
        }
     
        public void displayAvailableBooks ()
        {
     
        }
     
        public void displayBooksOnLoan ()
        {
     
        }
     
        public void borrowBook ()
        {
     
        }
     
        public void returnBook ()
        {
     
        }
     
        static void displayMenu ()
        {
            int menuChoice;
     
            System.out.println("Welcome to the Class Library System\n");
            System.out.println("1.\tAdd Book\n");
            System.out.println("2.\tDisplay available books\n");
            System.out.println("3.\tDisplay books currently on loan\n");
            System.out.println("4.\tBorrow Book\n");
            System.out.println("5.\tReturn Book\n");
            System.out.println("6.\tWrite book details to file\n");
            System.out.println("7.\tExit\n");
     
            // Prompt user to choose an option
     
            System.out.println("Please choose one of the above options: ");
     
            // Store users' choice as a variable
     
            menuChoice = keyboard.nextInt();
     
            switch (menuChoice)..............

    loanBook class
    public class loanBook
    {
        String title, author, status;
        private int bookId;
        static int count=1;
        private pupil pupil;
     
        public loanBook (String title, String author)
        {
            this.title = title;
            this.author = author;
            this.status = "Available";
            this.bookId = count;
            count ++;
        }
    }

    pupil class
    public class pupil
    {
        private String firstname, surname;
        private Scanner keyboard = new Scanner(System.in);
     
        public pupil (String firstname, String surname)
        {
            this.firstname = firstname;
            this.surname = surname;
        }
     
        public String toString()
        {
            return (firstname + surname);
        }
     
        public void getPupil()
        {
            System.out.println("Please enter pupils first name : ");
            firstname = keyboard.nextLine();
            System.out.println("Please enter pupils surname : ");
            surname = keyboard.nextLine();
     
        }
    }


  2. #2
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    Default Re: Can anyone give me help/advice on this java library program?

    Ok, well the books have a status. I assume that is an indication for whether they are available, borrowed, or loaned? If so, you need to loop through your bookArray and check each book's status. If the status is correct for whichever method you are creating, print it out (or do whatever the method is supposed to do).
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    Default Re: Can anyone give me help/advice on this java library program?

    Hi aussiemcgr.
    Yea i created a status so that the following can happen. When a new book is added the status is 'available'. If the book is taken on loan then it should change to 'borrowed'. Just not sure on how to about this.

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    Default Re: Can anyone give me help/advice on this java library program?

    Status are generally stored as enumerations: Enum Types (The Java™ Tutorials > Learning the Java Language > Classes and Objects)
    For example, you would have a class like:
    public enum BookStatus {
    	AVAILABLE,
    	BORROWED;
    }
    And then instead of your status variable being a String, it would be a BookStatus.
    You reference enums statically, like:
    BookStatus status = BookStatus.AVAILABLE;
    So all books should be given an AVAILABLE status when you create them. Then, when someone borrows one, you change the status variable to BORROWED.
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    drunkinduncan (December 16th, 2013)

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    Default Re: Can anyone give me help/advice on this java library program?

    Class names begin with capital letters.

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    drunkinduncan (December 16th, 2013)

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    Default Re: Can anyone give me help/advice on this java library program?

    i followed your advice but how do i check the status. im thinking along the lines of the following but what condition do i use in the if statement?

    public String displayAvailableBooks ()
        {
            for (int i=0; i < bookArray.length; i++)
            {
                if (?????????)
     
                    return (LoanBook.class.toString());
     
                else
                    System.out.println ("There are currently no books available");
     
            }
     
        }

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    Default Re: Can anyone give me help/advice on this java library program?

    Enums can be compared with ==.
    So you can say:
    if(bookArray[i].status==BookStatus.AVAILABLE)
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    Default Re: Can anyone give me help/advice on this java library program?

    Ok iv done this but i know im missing something here as the word status in the if statement is highlighted in red?

    public class BookArray
    {
        static Scanner keyboard = new Scanner(System.in);
     
        LoanBook [] bookArray = new LoanBook[5];
        static String title, author;
     
     
        public enum bookStatus
        {
            AVAILABLE, BORROWED
     
        }
     
        public void addBook ()
        {
            for (int count=0; count<bookArray.length; count++)
            {
                System.out.println("Please enter the book title :\t");
                title = keyboard.nextLine();
                System.out.println("Please enter the book author :\t");
                author = keyboard.nextLine();
                bookStatus status = bookStatus.AVAILABLE;
     
                bookArray[count] = new LoanBook(title, author);
            }
        }
     
     
        public String displayAvailableBooks ()
        {
            for (int i=0; i < bookArray.length; i++)
            {
                if (bookArray[i].status==bookStatus.AVAILABLE)
     
                    return (LoanBook.class.toString());
                else
     
                    System.out.println("There are currently no books available");
            }
     
        }

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    Default Re: Can anyone give me help/advice on this java library program?

    Is it an error? Perhaps the status variable is not within the scope of that line of code (you cannot access the status variable directly). Add a getter to your LoanBook class, which returns the status variable. Then use that in your if statement instead of a direct reference.
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    Default Re: Can anyone give me help/advice on this java library program?

    it says 'cannot resolve symbol status'. it also says (in the addBook option) 'the variable status is never used'

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    Default Re: Can anyone give me help/advice on this java library program?

    What does your LoanBook class currently look like?
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    Default Re: Can anyone give me help/advice on this java library program?

    public class LoanBook
    {
        String title, author;
     
        int bookId;
        static int count=1;
        private Pupil pupil;
     
        public LoanBook (String title, String author)
        {
            this.title = title;
            this.author = author;
            this.bookId = count;
     
            count ++;
        }
     
        public String toString ()
        {
            return ("Title :\t" +this.title+ "\nAuthor :\t" +this.author);
        }
     
     
    }

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    Default Re: Can anyone give me help/advice on this java library program?

    You need to have a variable in your LoanBook class:
    bookStatus status;
    NOTE TO NEW PEOPLE LOOKING FOR HELP ON FORUM:

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    3. Give us an example of what the output should look like when done correctly.

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    Default Re: Can anyone give me help/advice on this java library program?

    Thanks its looking good now. Il give the rest a go now

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    Default Re: Can anyone give me help/advice on this java library program?

    Ok here's what i have ended up with. Still doesn't seem right to me so any suggestions would be appreciated. Should i have 2 more arrays for fiction and non-fiction?

    public class MainMenu
    {
        public static void displayMenu ()
        {
            //variables
            int menuChoice;
            Scanner keyboard = new Scanner(System.in);
     
            System.out.println("Welcome to the Class Library System\n");
            System.out.println("1.\tAdd Book\n");
            System.out.println("2.\tDisplay available books\n");
            System.out.println("3.\tDisplay books currently on loan\n");
            System.out.println("4.\tBorrow Book\n");
            System.out.println("5.\tReturn Book\n");
            System.out.println("6.\tWrite book details to file\n");
            System.out.println("7.\tExit\n");
     
            // Prompt user to choose an option
     
            System.out.println("Please choose one of the above options: ");
     
            // Store users' choice as a variable
     
            menuChoice = keyboard.nextInt();
     
            switch (menuChoice)
            {   // switch
     
                // If option 1 is selected
                case 1:     LoanBook.addBook();
     
                    break;
     
                // If option 2 is selected
                case 2:      System.out.println("The following books are available\n");
                             LoanBook.displayAvailableBooks();
     
                    break;
     
                // If option 3 is selected
                case 3:      System.out.println("The following books are on loan\n");
                             LoanBook.displayBooksOnLoan();
     
                    break;
     
                // If option 4 is selected
                case 4:     LoanBook.borrowBook();
     
                    break;
     
                // If option 5 is selected
                case 5:     LoanBook.returnBook();
     
                    break;
     
                // If option 6 is selected
                case 6:     LoanBook.writeToFile();
     
                    break;
     
                // If option 7 is selected exit program
                case 7:     System.out.println("Thank you for using the program....Goodbye!");
                    break;
     
                // If option is not recognised display output
                default:    System.out.println(" Choice not recognised....Access denied!!!!");
     
            }   // switch
     
        } // displayMenu
     
        public static void main (String[]args)
        {
            displayMenu();
        }
    }
    LoanBook class
    public class LoanBook
    {
        //class variable
        private static int nextBookId=1;
     
        private static Scanner keyboard = new Scanner(System.in);
        private static int temp;
        private static boolean choice = false;
     
        static LoanBook [] books = new LoanBook[10];
        bookStatus status;
        //instance variables
        private String title, author;
        //title and author of book
        private int bookId;
        //unique ID number for book
     
        public LoanBook (String title, String author)
        {
            this.title = title;
            this.author = author;
            this.bookId = nextBookId;
     
            nextBookId ++;
        }//constructor
     
        public String toString()
        {
            return ("\nBook ID :\t" +this.bookId+ "\nTitle :\t" +this.title+ "\nAuthor :\t" +this.author+ "\n");
        }
     
        public enum bookStatus //declare values of bookStatus
        {
            AVAILABLE, BORROWED
     
        }
     
        //method to add book
        public static void addBook ()
        {
            for (int i=0; i < books.length; i++ )
            {
                System.out.println("Please enter the book title :\t");
                books[i].title = keyboard.nextLine();
                System.out.println("Please enter the book author :\t");
                books[i].author = keyboard.nextLine();
                books[i].status = bookStatus.AVAILABLE;
                do
                {
                    System.out.println("Please select book type by entering the corresponding number");
                    System.out.println("1: Fiction");
                    System.out.println("2: Non-Fiction\n");
                    temp = keyboard.nextInt();
                    if (temp==1)
                    {
                        LoanFiction.getGenre();
                        choice = true;
                    }
                    else if (temp==2)
                    {
                        LoanNonFiction.getTopic();
                        choice = true;
                    }
                    else
                        System.out.println("Incorrect option. Please try again");
     
                } while (!choice);
            }
        } //addBook
     
        //method to display available books
        public static String displayAvailableBooks ()
        {
            for (int i=0; i < books.length; i++)
            {
                if (books[i].status==bookStatus.AVAILABLE)
                {
                    return (books[i].toString());
                }
     
                else
                {
                    System.out.println("There are currently no books available");
                }
     
            }
     
            return null;
        }
     
        //method to display books on loan
        public static String displayBooksOnLoan ()
        {
            for (int i=0; i < books.length; i++)
            {
                if (books[i].status==bookStatus.BORROWED)
                {
                    return (books[i].toString()+" currently on loan to " +Pupil.class.toString());
                }
     
                else
                {
                    System.out.println("There are currently no books on loan");
                }
     
            }
     
            return null;
        }
     
        //method to borrow book
        public static String borrowBook ()
        {
            int i, in;
            System.out.println("The following books are available to borrow\n");
     
            displayAvailableBooks();
     
            do
            {
                System.out.println("Please enter the Book Id that you would like to borrow : ");
                in = keyboard.nextInt();
     
     
     
                for (i=0; i < books.length; i++)
                {
                    if ((books[i].status==bookStatus.AVAILABLE)&&(in==books[i].bookId))
                    {
                        Pupil.getPupil();
                        System.out.println("You have successfully borrowed the following book :\n ");
                        return (books[i].toString());
                        books[i].status=bookStatus.BORROWED;
                    }
                    else
                    {
                        System.out.println("Invalid book id: Please try again!");
                    }
                }
            }   while (in!=books[i].bookId);
     
            return null;
        } //borrowBook
     
        //method to return book
        public static String returnBook ()
        {
            int i, in;
            System.out.println("The following books are on loan\n");
            displayBooksOnLoan();
     
            do
            {
                System.out.println("Please enter the book id of the book being returned : ");
                in = keyboard.nextInt();
     
                for (i=0; i < books.length; i++)
                {
                    if ((books[i].status==bookStatus.BORROWED)&&(in==books[i].bookId))
                    {
                        System.out.println("You have successfully returned the following book :\n ");
                        return (books[i].toString());
                        books[i].status=bookStatus.AVAILABLE;
                    }
                    else
                    {
                        System.out.println("Invalid book id: Please try again!");
                    }
                }
            }   while (in!=books[i].bookId);
            return null;
        } //returnBook
     
        public static void writeToFile()
        {
            String myFileName = "output.txt";
            boolean open = false;
            PrintWriter myOutFile;
     
            try
            {
                myOutFile = new PrintWriter(myFileName);
                open = true;
     
            }
            catch (FileNotFoundException ex)
            {
                System.out.println("Error opening the file");
                open = false;
     
                return;
            }
     
            try
            {
                if (open)
                {
                    myOutFile.print(books.toString());
                    myOutFile.close();
                    open = false;
     
                    System.out.println("Successfully written to file and closed");
                }
     
            }
     
            catch (Exception ex)
            {
                System.out.println("Exception "+ex.getMessage()+" caught");
            }
     
        }
    }
    public class LoanFiction extends LoanBook
    {
        static Scanner keyboard = new Scanner(System.in);
        static int temp;
        static boolean option = false;
        static String genre;
     
        public LoanFiction (int topic, String title, String author)
        {
            super(title, author);
            this.genre = genre;
     
        }//constructor
     
        public static void getGenre()
        {
            do
            {
                System.out.println("Please choose the genre by entering the corresponding number");
                System.out.println("1: Comedy");
                System.out.println("2: Adventure");
                temp = keyboard.nextInt();
                if (temp ==1)
                {
                    genre = "Comedy";
     
                    option = true;
                }
                else if (temp ==2)
                {
                    genre = "Adventure";
                    option = true;
                }
                else
                    System.out.println("Incorrect option. Please try again");
     
            }   while (!option);
        }
     
        public String toString()
        {
            return (super.toString()+"Fiction Genre : \t"+genre+"\n");
        }
    }
    public class LoanNonFiction extends LoanBook
    {
        static int temp;
        static Scanner keyboard = new Scanner(System.in);
        static String topic;
        static boolean option = false;
     
        public LoanNonFiction (String title, String author)
        {
            super(title, author);
            this.topic = topic;
        }//constructor
     
        public static void getTopic ()
        {
            do
            {
     
                System.out.println("Please choose the topic by entering the corresponding number");
                System.out.println("1: History");
                System.out.println("2: Reference");
                temp = keyboard.nextInt();
                if (temp ==1)
                {
                    topic = "History";
     
                    option = true;
                }
                else if (temp ==2)
                {
                    topic = "Reference";
                    option = true;
                }
                else
                    System.out.println("Incorrect option. Please try again");
     
            }   while (!option);
        }
     
        public String toString()
        {
            return ("Non-Fiction Topic : \t"+topic+"\n");
        }
    }
    public class Pupil
    {
        private static String firstName, surname;
        private static Scanner keyboard = new Scanner(System.in);
     
        //contructor
        public Pupil (String firstName, String surname)
        {
            this.firstName = firstName;
            this.surname = surname;
        }
     
        public String toString()
        {
            return (firstName + surname);
        }
     
        public static void getPupil()
        {
            System.out.println("Please enter pupils first name : ");
            firstName = keyboard.nextLine();
            System.out.println("Please enter pupils surname : ");
            surname = keyboard.nextLine();
     
        }
    }

  19. #16
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    Default Re: Can anyone give me help/advice on this java library program?

    Data about the books is not kept in arrays. Data about the books is kept in the LoanBook class (I think that's' the class that describes each book, but there are no comments that describes the purpose of each class is).

    Notice the class names "LoanBook", "LoanFiction," and "LoanNonFiction" are actions. Classes are things or objects. Classes ARE things. Methods perform actions. Methods DO things. The class "LoanBook" should be called Book or maybe LibraryBook or BookToLoan. The class Book should have a fiction/nonfiction attribute. I see no reason for the classes LoanFiction and LoanNonFiction to exist or for them to extend LoanBook, though they might make good Library methods.

    The classes I think your project should have are (at a minimum): Library, Book, and Customer. Library can either be the class with the main() method or there might be another class that presents the library's menu. If you had plans to evolve this program to a GUI, then the latter option would be preferred.

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    Default Re: Can anyone give me help/advice on this java library program?

    Thanks Greg. Yea normally that's the way i would have went about this but it's an assignment and we've been given instructions to have a main application class, a loanBook class, a Fiction and nonFiction subclass. Im now thinking that i should just have 2 arrays called fiction and nonfiction. Iv had my head stuck in this for too long and keep leaving it and coming back to it which doesnt help.

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    Default Re: Can anyone give me help/advice on this java library program?

    I'm sorry. Assignments don't always make sense, and those subclasses, as you've explained them, are inexplicable. What I could see for academic exercise purposes is:

    Book - a super class, maybe abstract
    FictionBook - extends Book
    NonFictionBook - extends Book

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    Default Re: Can anyone give me help/advice on this java library program?

    Yea my thoughts exactly are that loanBook should ideally be a method to loan a book and this is the part creating most of the problems. Well its due to be handed in today so i will make a few last minute tweaks and just go with it. I'll update the post when i receive feedback on it. Many thanks to everyone who took the time to help.

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