Java: File I/O

The following program will throw an exception at the indicated section. Don't know how to fix it

Code:

---

iimport java.io.*;

public class MainTwo
{
    private RandomAccessFile ioFile;
   
    public MainTwo( String file )
    {
        try
        {
            ioFile = new RandomAccessFile( file, "rw" );
        }
        catch ( FileNotFoundException e )
        {
            System.err.println ( "Mmm?" );
        }
    }
   
    public void write( String str, int length ) throws IOException
    {
        StringBuffer buffer = new StringBuffer( str );
        buffer.setLength( length );
       
        ioFile.writeChars( buffer.toString() );
     
    }
   
    public String read( int length ) throws IOException
    {
        char arr[] = new char[ length ];
        char temp;
       
        for ( int count = 0; count < length; count++ )
        {
            temp = ioFile.readChar();
            arr[ count ] = temp;
        } 
       
        return new String( arr ).replace( '\0', ' ' );
    }
   
    public void kill()
    {
        try
        {
            if ( ioFile != null )
                ioFile.close();
        }
        catch ( IOException e )
        {
            System.err.println( "Great?" );
        }
    }
   
    public static void main( String args[] )
    {
        MainTwo app;
        String msg;
        String anotherMsg;
 
        app = new MainTwo( "Data.bin" );
             
        msg = "Got Java?";
        try
        {
            app.write( msg, msg.length() );
        }
        catch ( IOException e )
        {
            System.err.println( "What the?" );
        }
       
      try
        {
            anotherMsg = app.read( msg.length() );
        }
        catch ( IOException e )
        {
            System.err.println( "Ouch" );
        }
       
        app.kill();
    }
}

---

your getting an exception because the file pointer is at the end of the file after writing (ie. there is nothing to read).

btw: do you have to read one byte at a time for some reason? there are easier ways to do such things.

see: http://java.sun.com/j2se/1.4.2/docs/...ccessFile.html

kewl, thnx