CODEWITHSUNDEEP
javaio
Ankit
Ankit

Reputation: 639

Why I am getting this output on screen while the file I am writing to is fine?

Sample code is :-

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;

public class CopyBytes {

    public static void main(String [] args){
    CopyBytes obj = new CopyBytes();
    File file = new File("/home/mount/Data/JAVA/xanadu.bak");
    obj.copyBytes(file);
    }

    public void copyBytes(File ifile){
    FileInputStream reader = null;
    FileOutputStream output =null;
    int c=0;
    try{
    reader = new FileInputStream(ifile);
    output = new FileOutputStream("outfile");
    while((c = reader.read()) != -1)
    {
        System.out.print(c);
        output.write(c);
    }   
        System.out.println();
    }
    catch(FileNotFoundException fnfex){
    fnfex.getMessage();
    fnfex.printStackTrace();
    }
    catch(IOException ioex){
    ioex.getMessage();
    ioex.printStackTrace();
    }
    finally{
    if(reader !=null)
    {
        System.out.println("Closing the Stream");
        try{
        reader.close();
        System.out.println("Closed the Streams");
        }
        catch(IOException ioex)
        {
            ioex.printStackTrace();
        }
    }
    else{
    System.out.println("Stream not open");
    }
}
}
}

Contents of the xanadu.bak are as follows:-

buffer@ankit:/home/mount/Data/JAVA/practice/src/fileio.bytestreams.com$ cat /home/mount/Data/JAVA/xanadu.bak
IA

When above code is run;it gives following output:

buffer@ankit:/home/mount/Data/JAVA/practice/src/fileio.bytestreams.com$ java CopyBytes 

736510
Closing the Stream
Closed the Streams

whereas i should get 

7365
Closing the Stream
Closed the Streams

The file to which I am writing is perfectly fine. Please provide your valuable inputs.

Upvotes: 0

Views: 106

Answers (1)

Mat
Mat

Reputation: 206679

The last character printed is 10d, or 0x0A. That's a newline character. Other combinations like 0x0D 0x0A or the reverse could happen on other platforms.

A lot of editors add a newline at the end of files if there isn't one, and that's what you're seeing.

Use something like hexdump to ascertain what your file really contains.
You code works pretty well for that too :-)

Upvotes: 1

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