Java Programming

Hello,

I'm developing an application on J2ME that needs to read from files.
I want to use binary files instead text files, because I think that in this way I have two benefits:
1. reducing the jar size
2. speeding up the reading process.

that's the starting point...and I hope this approach is right.

I've developed a small class in J2SE just as an utility to convert .txt files in .bin files and...GULP!!!...a txt file of 22KB becomes 44KB converted in .bin...there is something wrong, but I don't know.

here is the code I wrote:

package texttobin;
import java.io.*;
public class Main {
    
    public static void main(String[] args) {
        
        File inFile  = null;    //the file to read
        File outFile = null;    //the file to write
        
        //read the path from commandline
        if (args.length > 0)
        {
            inFile = new File(args[0]);
            outFile = new File(args[1]);
        }
        
        //some checkings
        if (inFile == null) return;
        if (outFile == null) return;
        
        try {
            //setup the streams
            FileOutputStream outputStream = new FileOutputStream (outFile);
            DataOutputStream dataOutputStream = new DataOutputStream (outputStream);
            FileInputStream sourceStream = new FileInputStream(inFile);
            
            byte readingByte[] = new byte[1];
            
            while(true) {
                if (sourceStream.read(readingByte)!=-1) {
                    //to be sure: I convert the readed input byte in a string
                    //and pass the char inside to the writeChar method... 
                    dataOutputStream.writeChar(new String(readingByte).charAt(0));
                    //the same result is achieved with:
                    //dataOutputStream.writeChars(new String(readingByte));
                }
                else break;
            }
            
            dataOutputStream.close();
            outputStream.close();
            sourceStream.close();
            
        }
        catch(FileNotFoundException fnfe)
        {
            System.out.println (fnfe);
            return;
        }
        catch(IOException ioe)
        {
            System.out.println (ioe);
            return;
        }
    } 
}

WHAT'S WRONG?!

THANKS A LOT!!!

daniele