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dont know why i'm not getting output. help

 

dont know why i'm not getting output. help
carman69

12 Nov, 2008 - 07:41 PM
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the program runs in eclipse but displays no output. Anyone know why??




CODE
package Readafile;

import java.util.Scanner;

public class Readafile {

    
    
    public static void main(String[] args) {
        Scanner inputFile = new Scanner("books.txt");
        while(inputFile.hasNext());
        System.out.println(inputFile.next() + "");
        
        

    }

}


This post has been edited by Jayman: 12 Nov, 2008 - 07:47 PM

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Jayman

RE: Dont Know Why I'm Not Getting Output. Help

12 Nov, 2008 - 07:48 PM
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Do you have anything in the books.txt file?
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carman69

RE: Dont Know Why I'm Not Getting Output. Help

12 Nov, 2008 - 07:50 PM
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QUOTE(Jayman @ 12 Nov, 2008 - 07:48 PM) *

Do you have anything in the books.txt file?




yes the file contains a list for books
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n8wxs

RE: Dont Know Why I'm Not Getting Output. Help

12 Nov, 2008 - 08:47 PM
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Change
java

        while(inputFile.hasNext());
        System.out.println(inputFile.next() + "");

to
java

        while(inputFile.hasNext()) {
            System.out.println(inputFile.next() + "");
        }
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Jayman

RE: Dont Know Why I'm Not Getting Output. Help

12 Nov, 2008 - 08:49 PM
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Remove the semi-colon from the end of your while loop.

CODE

while(inputFile.hasNext())
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carman69

RE: Dont Know Why I'm Not Getting Output. Help

13 Nov, 2008 - 05:09 AM
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QUOTE(Jayman @ 12 Nov, 2008 - 08:49 PM) *

Remove the semi-colon from the end of your while loop.

CODE

while(inputFile.hasNext())







Thanks i'll give that a try.

QUOTE(carman69 @ 13 Nov, 2008 - 05:04 AM) *

QUOTE(Jayman @ 12 Nov, 2008 - 08:49 PM) *

Remove the semi-colon from the end of your while loop.

CODE

while(inputFile.hasNext())







Thanks i'll give that a try.


The program does output noe but it outputs the file name. How do I get it to read the file??
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ajaymatrix

RE: Dont Know Why I'm Not Getting Output. Help

13 Nov, 2008 - 06:21 AM
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you have to create a new File (pathname) in your scanner

CODE

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;


public class ReadAFile {

    public static void main(String[] args) {
        Scanner inputFile;
        try {
//don't know how to give relative path..try solving that
            inputFile = new Scanner(new File("C:\\workspace\\FileReader\\src\\books.txt"));

            
            while(inputFile.hasNext()){
                    System.out.println(inputFile.next() + "");
             }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
      
        
        

    }

}



and remember to use try catch, so that you know where the error is coming
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pbl

RE: Dont Know Why I'm Not Getting Output. Help

13 Nov, 2008 - 06:07 PM
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Because you create a Scanner on the String "books.txt"
You have to make the scanner on the File

CODE

    public static void main(String[] args) {
        Scanner inputFile = new Scanner(new File("books.txt"));
        while(inputFile.hasNext())
        System.out.println(inputFile.next() + "");
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