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Thread: Reading a file

  1. #1
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    Default Reading a file

    Hey,

    What I need to do is read a file- it will have a name and several numbers after, with -1 as a sentinel number to signal the end of line, ex:

    Rogers 15 22 6 12 -1
    Myers 23 10 4 22 34 -1
    ...
    ....
    .....

    What I want to do is take the numbers, except -1, read them, and display an average of each name's numbers, alone with the name with the highest number.

    So far I can read the file and display it, but I'm not sure how to gather the numbers inside of the file and use them for displaying averages and maximum.

    import java.io.*;
    import java.util.Scanner;
    public class HW7
    {
       public static void main (String[] args) throws IOException {
        Scanner keyboard = new Scanner(System.in);
     
        System.out.println("What is the name of the file?");
        String fileName = keyboard.nextLine();
     
        File file = new File(fileName);
        Scanner inputFile = new Scanner(file);
     
        while (inputFile.hasNext())
        {
     
            String line = inputFile.nextLine();
            System.out.println(line);
     
    }
     
     
        }
     
     
        }


  2. #2
    Administrator copeg's Avatar
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    Default Re: Reading a file

    You can parse through each line by using a StringTokenizer (Java Platform SE 6) From there you can parse a String representation of an integer to an int using Integer.parseInt().

  3. #3
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    Default Re: Reading a file

    Thank you,

    I should have mentioned however, that I'm trying to do this as practice for a class and I should only use the File reader and scanner, along with loops to do the aforementioned. I'm stuck when it comes to breaking apart the file and gathering the numbers.

    I know that for the maximum I should get the first number, assign that to the maximum, and while there are more numbers, get the next number, and if that is higher, it then becomes the maximum. I'm just lost when it comes to putting this into code.

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