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Thread: counting the values in input file and and writing the output to a file

  1. #1
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    Default counting the values in input file and and writing the output to a file

    Can any one please correct this code. This is to read a file and later it should write the output to a file. Input file has 20 rows and 4 columns. If we have 1 in the 1st column of the input file then it should count all 1's and write those 1s counted value to a file.
    Code:

    import java.io.*;
    import java.util.*;
    import java.lang.ClassNotFoundException;
    class Code
    {
    public static void main(String[] args) throws IOException
    {
    String str[][] = new String[20][4];
    FileReader fr = new FileReader("in.txt");
    BufferedReader br = new BufferedReader( fr );
    FileWriter fw = new FileWriter("out.txt");
    PrintWriter pw = new PrintWriter(fw);
    String line = "";
    int i = 0, j= 0, one=0, two=0,three=0;
    while( ( line = br.readLine() ) != null )
    {
    StringTokenizer tok = new StringTokenizer(line, ", ");
    if(str[i][0].equals("1") )
    {
    one = one++;
    }
    else if(str[i][0].equals("2") )
    {
    two = two++;
    }
    else if(str[i][0].equals("3") )
    {
    three = three++;
    }
    i++;
    }
    br.close();
    fr.close();
    System.out.println("Sending the output to file:");
    for(i=0;i < 20; i++)
    {
    for(j=0;j<4; j++)
    {
    System.out.printf("one" +one);
    pw.print(one);
    System.out.println("two" +two);
    pw.print(two);
    System.out.println("three" +three);
    pw.print(three);
    }
    pw.println();
    }
    pw.close();
    fw.close();
    }
    }


  2. #2
    Administrator copeg's Avatar
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    Default Re: counting the values in input file and and writing the output to a file

    Can any one please correct this code
    We can help YOU correct it, provided you tell us what's wrong in the first place. And please use the code tags, and please be forthright when crossposting

    This thread has been cross posted here:

    http://www.roseindia.net/answers/viewqa/Java-Beginners/26756-counting-the-values-in-input-file-and-and-writing-the-output-to-a-file.html

    Although cross posting is allowed, for everyone's benefit, please read:

    Java Programming Forums Cross Posting Rules

    The Problems With Cross Posting

    Last edited by copeg; July 4th, 2012 at 09:15 AM.

  3. The Following User Says Thank You to copeg For This Useful Post:

    srujirao (July 4th, 2012)

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    Default Re: counting the values in input file and and writing the output to a file

    As i am new to these forums i really don't know about this. I have gone through the links which you have mentioned about the cross posting. Thanks for telling this.

    I didn't get what you are asking about. " provided you tell us what's wrong in the first place. "

  5. #4
    Junior Member ShadeDarkan's Avatar
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    Default Re: counting the values in input file and and writing the output to a file

    You are accessing your String Array from the While loop, but you haven't populated it with anything. That is going to throw and error. The next problem is that you are breaking up the input line with StringTokenizer, but you don't do anything with the data. Your while loop isn't actually comparing and counting any of the input data so your output file is just going to be a bunch of zeros.
    We need some more clarification on what exactly the program should be doing. I don't understand exactly what should be output into a file and what you are trying to count from the input.

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