Writing binary data to file ???

Question

Hi all,
I am facing a strange problem in my java program. Please go through the following code...
import java.io.*;
public class Hex2BinFile
Hex2BinFile()
boolean hex2bin(String source,String destFile)
try
PrintWriter opGif = new PrintWriter ( new FileWriter(destFile, false));
int strlen = source.length();
for ( int i = 0; i < strlen; i += 2)
opGif.print((char)Integer.parseInt(source.substring(i, i+2), 16));
opGif.flush();
opGif.close();
catch(Exception e)
System.out.println(e);
return false;
return true;
public static void main(String [] args)
Hex2BinFile hbf = new Hex2BinFile();
hbf.hex2bin("05", "/home/oracle/1.bin"); // resulting file size is 1 byte
hbf.hex2bin("AF", "/home/oracle/2.bin"); // resulting file size is 2 byte
This is a very simple class. In this class hex2bin() function takes hex string, and then convert it to binary value (character by character) and write binary value to a specified file.
In the above mentioned code, in main() method, i am calling hex2bin() method twice.
In the first call the result is satisfactory and a file (1.bin) is created with file size 1 byte as i am passing one byte hex value to this function.
But in the second call to hex2bin(), I am also passing 1 bye hex value, and resulting file size is 2 bytes. I also observe that when I pass a value greater than '7F' hex, the resulting file size is two byte.
What is the cause of this inconsistancy? is there any error or problem? and what is the solution? Please guide me.
Thanks in advance...

Answer 1

Thank u very much,
     FileOutputStream opGif = new FileOutputStream(destFile, false);
I have changed above line with the following line:
     PrintWriter opGif = new PrintWriter ( new FileWriter(destFile, false));
and now this code is working very fine.
Thanks once again...