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Thread: My text input file is not working correctly?

  1. #1
    Junior Member
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    Default My text input file is not working correctly?

    ublic class Book
    {
    String author, area, isbn;
    int length;

    public Book(String isbn, String author, String area, int length)
    {
    this.isbn = isbn;
    this.author = author;
    this.area = area;
    this.length = length;
    }

    public boolean isLong()
    {
    if(length > 600)
    return true;
    else
    return false;
    }

    public String getAuthor()
    {
    return author;
    }

    public String getArea()
    {
    return area;
    }

    public int getLength()
    {
    return length;
    }

    public String toString()
    {
    String s;
    return s = "[BOOK ISBN: " +isbn + ", AUTHOR: " + author + "AREA: " + area + "PAGES: " + length + "]";
    }

    public String mathCS()
    {
    if (area.equals("MATH"))
    return "MATH";
    if (area.equals("CS"))
    return "CS";
    else
    return "Other";
    }

    }



    import java.util.*;
    import java.io.*;
    import java.util.ArrayList;
    import java.text.DecimalFormat;
    public class BookCollection
    {
    private ArrayList<Book> bookList = new ArrayList<Book>();

    public void BookCollecion() throws IOException
    {
    Scanner scan;
    Scanner fileScan = new Scanner(new File("Books.txt"));
    String aLine, isbn, author, area;
    int length;
    Book aBook;

    while(fileScan.hasNext())
    {
    aLine = fileScan.nextLine();
    scan = new Scanner(aLine);

    isbn = scan.next();
    author = scan.next();
    area = scan.next();
    length = scan.nextInt();

    aBook = new Book(isbn, author, area, length);
    bookList.add(aBook);
    }

    }

    public void displayLongBooks()
    {
    System.out.println("LONG BOOKS");
    for(int i = 0; i<bookList.size(); i++)
    {
    if(bookList.get(i).isLong())
    {
    bookList.get(i).toString();
    }
    }

    }


    public void displayAverageLength()
    {
    double avg = 0;

    for(int i = 0; i < bookList.size(); i++)
    {
    avg += bookList.get(i).getLength();
    }
    System.out.println("AVERAGE LENGTH\n");
    System.out.println(avg/bookList.size());
    }

    public void displayMathCSBooks()
    {
    System.out.println("");
    System.out.println("MATH and COMPUTER SCIENCE BOOKS");

    for(int i = 0; i < bookList.size(); i++)
    {
    if(bookList.get(i).mathCS().equals("MATH") || bookList.get(i).mathCS().equals("CS"))
    bookList.get(i).toString();
    }

    }

    public void displayBooksFromAuthor(String author){
    int a = 0;
    System.out.println(author + "'s BOOKS");

    for(int i = 0; i < bookList.size(); i++)
    {
    if (bookList.get(i).getAuthor().equals(author)){
    System.out.println (bookList.get(i));
    a++;}
    }
    if (a == 0)
    System.out.println("There are no books authored by " + author + ".");

    }

    public void displayBooksFromArea (String area)
    //displays all books from given area (in analogous way)
    {

    for(int i = 0; i < bookList.size(); i++)
    {
    if (bookList.get(i).getArea().equals(area))
    bookList.get(i);
    }
    }
    public void displayOtherBooks()
    {
    System.out.println("");
    System.out.println("OTHER BOOKS");

    for(int i = 0; i < bookList.size(); i++)
    {
    if(bookList.get(i).mathCS().equals("Other"))
    bookList.get(i).toString();
    }

    }

    public String toString()
    {
    String book = "ALL BOOKS\n";

    for(int i = 0; i<bookList.size(); i++)
    book += bookList.get(i) + "\n";

    return book;
    }
    }

    import java.io.*;
    import java.util.Scanner;
    public class TestBookCollection {

    public static void main(String args[]) throws IOException
    {
    Scanner input = new Scanner(System.in);
    BookCollection test = new BookCollection();

    test.toString();
    test.displayLongBooks();

    System.out.println();
    System.out.print("Enter author name: ");
    String author = input.nextLine();
    System.out.println();
    test.displayBooksFromAuthor(author);

    System.out.println();
    System.out.print("Enter another author name: ");
    author = input.nextLine();
    System.out.println();
    test.displayBooksFromAuthor(author);


    //test.displayBooksFromArea(area);

    test.displayAverageLength();

    test.displayMathCSBooks();

    test.displayOtherBooks();
    }
    }


  2. #2
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    Default Re: My text input file is not working correctly?

    Content Within Text File:

    1001-01-171714 Lewis CS 699
    1002-01-771424 Lewis CS 477
    1003-01-141434 Jones MATH 698
    1004-01-141444 Jones CS 617
    1005-01-141454 Brown CHEM 326
    1006-01-141464 Jones BIO 127
    1007-01-771474 Sanders CS 998

  3. #3
    Super Moderator curmudgeon's Avatar
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    Default Re: My text input file is not working correctly?

    I see that you've posted a bit of code and the contents of a file, but I can't find a clear well defined question anywhere. What exactly are you asking here?

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: My text input file is not working correctly?

    Also please Edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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