2

I am a beginner in programming.

I am trying to read the first word of every line from a file, and I want to write all of the first words to another file.

I have done the following code.

import java.io.*;
import java.nio.charset.Charset;

public class ReadWord
 {
   public static void main(String args[])
     {
    BufferedReader br;
    String line;
    int count = 0;
    InputStream fis = null;

    try
    {
        fis = new FileInputStream("D:/Android/WorkSpace10-1/FileHandling.Java/src/123.txt");
        br = new BufferedReader( new InputStreamReader(fis, Charset.forName("UTF-8")));
        while((line = br.readLine())!=  null)
        {
            System.out.println(line);
            String result[] = line.split(",");
            while(line!=",")
            {                   
              System.out.println(result);               
            }               
        }               
    }

    catch(Exception e)
    {
        System.out.println(e);
    }

    finally
    {
        try
        {
            fis.close();
        }
        catch(IOException ie)
        {
            System.out.println(ie);
        }
    }
}
}

Please help me out how to read the first word of every line and write that word to another file.

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5
  • What is the current output? Commented Jun 12, 2013 at 14:15
  • If you use Java 7, use Files! Commented Jun 12, 2013 at 14:15
  • @colti.. Garbage Output. it goes in infinite loop.. Commented Jun 12, 2013 at 14:16
  • @fge.. thats what i am using.. Commented Jun 12, 2013 at 14:17
  • Errr, are you sure? See my answer... Commented Jun 12, 2013 at 14:20

3 Answers 3

Reset to default
1

AM not sure this is the best method you can split each line like this example:

String hello = "Hello world, How is everyone";
String[] split= hello.split(" ");
String first = split[0];

........

Then write it to the file using BufferedWriter like this:

BufferedWriter bw = new BufferedWriter(new FileWriter("MyFIle.txt"));

bw.write(first);
bw.newLine();

bw.close();

This is just a guide.

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Comments

1

Do yourself a favor: use Files.

Obtaining a BufferedReader to a file is as simple as:

final BufferedReader reader 
    = Files.newBufferedReader(Paths.get("pathToFile"), StandardCharsets.UTF_8);

Obtaining a BufferedWriter is as simple as:

final BufferedWriter writer
    = Files.newBufferedWriter(Paths.get("pathToFile"), StandardCharsets.UTF_8);

Reading all lines from a file is as simple as:

final List<String> lines 
    = Files.readAllLines(Paths.get("pathToFile"), StandardCharsets.UTF_8);

Etc etc. See the javadoc for Files. Anyone using Java 7 has no reason to use File anymore!

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Comments

0

I wrote the program for you to read the first word of every line from a file and then writes into another file. This is not a perfect program but it works and it at least should give a starting point.

String separator = System.getProperty( "line.separator" );
                 BufferedReader br;
                 String line;
                 InputStream fis = null;
                 File file = new File("C:\\junk\\out.txt");
                    // if file doesnt exists, then create it
                    if (!file.exists()) {
                        file.createNewFile();
                    }
                 FileWriter fw = new FileWriter(file.getAbsoluteFile());
                 BufferedWriter bw = new BufferedWriter(fw);

                 try
                 {
                     //your input file
                     fis = new FileInputStream("C:\\junk\\test.txt");
                     br = new BufferedReader( new InputStreamReader(fis, Charset.forName("UTF-8")));
                     while((line = br.readLine())!=  null)
                     {
                         System.out.println(line);
                         String result[] = line.split(" ");
                         String word = result[0];
                         bw.write(word);
                         bw.write(separator);
                     }    
                 }

                 catch(Exception e)
                 {
                     System.out.println(e);
                 }

                 finally
                 {
                     try
                     {
                         //close the files
                         fis.close();
                        bw.close();
                     }
                     catch(IOException ie)
                     {
                         System.out.println(ie);
                     }
                 }
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1 Comment

@stupefy welcome, feel free to give 1+ for this answer. happy I could help.

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