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Thread: This java program is adding up in a negative way....

  1. #1
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    Default This java program is adding up in a negative way....

    I have a program that has 2 options. 1;to read a file and 2, to add a file:


    The text file looks like this word for word:

    Yellow Submarine
    Beatles
    Rock
    Welcome to my life
    Simple plan
    Alternative
    Break
    Three Days Grace
    Rock

    There are 9 files and 3 arrays. One for songs, one for artists and one for genre

    the count is declared like this:

    int[] count = {0};


    NOW... If the user reads the program, then adds a file and then reads it again it will look like this:


    Yellow Submarine
    Beatles
    Rock
    Welcome to my life
    Simple plan
    Alternative
    Break
    Three Days Grace
    Rock
    NewSong
    NewArtist
    NewCateg
    Yellow Submarine
    Beatles
    Rock
    Welcome to my life
    Simple plan
    Alternative
    Break
    Three Days Grace
    Rock
    NewSong
    NewArtist
    NewCateg

    There are 24 files.... How can I fix this?

    static void Read (String[] Song, String[] Artist, String[] Category, int[] count, String[] database) throws IOException    //to open and view the database
        {
            BufferedReader reader = new BufferedReader (new FileReader (database [0] + ".txt"));
            System.out.println ("Here is your music collection: ");
            //  System.out.println ("First is a song, followed by the artist and last is the category: ");
            String line = null;
     
     
            while ((line = reader.readLine ()) != null)
            {
                Song [count [0]] = (line);
                line = reader.readLine ();
                Artist [count [0]] = (line);
                line = reader.readLine ();
                Category [count [0]] = (line);
                count [0]++;
            }
     
            reader.close ();
     
            System.out.println ("Song" + "                        " + "Artist" + "                          " + "Category"); // spacing is correct
            System.out.println ();
     
     
            for (int i = 0 ; i < count [0] ; i++)
            {
                System.out.print (Song [i]);
                for (int j = 0 ; j < (30 - Song [i].length ()) ; j++)
                    System.out.print (' ');
     
                System.out.print (Artist [i]);
                for (int j = 0 ; j < (30 - Artist [i].length ()) ; j++)
                    System.out.print (' ');
     
                System.out.print (Category [i]);
                for (int j = 0 ; j < (29 - Category [i].length ()) ; j++)
                    System.out.print (' ');
                System.out.println (' ');
     
            }
            System.out.println ("There are: " + count [0] + " songs");
    Last edited by seaofFire; April 23rd, 2012 at 11:17 AM.


  2. #2
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    Default Re: This java program is adding up in a negative way....

    It appears to be adding your entire collection when they add a file.

  3. #3
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    Default Re: This java program is adding up in a negative way....

    How can I make the program read the original file only once?
    the counter has no limit and if i set one:

    It gives me an error on the 74th line - for (int j = 0 ; j < (30 - Artist [i].length ()) ; j++)

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: This java program is adding up in a negative way....

    How do you indicate which file is to be read? Do you have the names of the files in a list? How do you go through the list to select its contents one at a time? Where do you move from one filename in the list to the next name in the list?
    If you don't understand my answer, don't ignore it, ask a question.

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