arabic RTF viewer problem

[nuur alif]

hello dear friends...

i do have done this code to view RTF file:

 
import java.awt.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.text.rtf.*;
 
class RTFViewextends JFrame
{
public RTFView()
{
setTitle( "RTF Text Application" );
setSize( 400, 240 );
setBackground( Color.gray );
getContentPane().setLayout( new BorderLayout() );
 
JPanel topPanel = new JPanel();
topPanel.setLayout( new BorderLayout() );
getContentPane().add( topPanel, BorderLayout.CENTER );
 
// Create an RTF editor window
RTFEditorKit rtf = new RTFEditorKit();
JEditorPane editor = new JEditorPane();
editor.setEditorKit( rtf );
editor.setBackground( Color.white );
 
// This text could be big so add a scroll pane
JScrollPane scroller = new JScrollPane();
scroller.getViewport().add( editor );
topPanel.add( scroller, BorderLayout.CENTER );
 
// Load an RTF file into the editor
try {
FileInputStream fi = new FileInputStream( "C:\\source\\arabic.rtf" );
rtf.read( fi, editor.getDocument(), 0 );
}
catch( FileNotFoundException e )
{
System.out.println( "File not found" );
}
catch( IOException e )
{
System.out.println( "I/O error" );
}
catch( BadLocationException e )
{
}
}
 
public static void main( String args[] )
{
// Create an instance of the test application
RTFView mainFrame= new RTFView();
mainFrame.setVisible( true );
}
}

the output in a frame viewer is : ����� ���� ����

hmm... for the arabic.rtf, i had type a arabic text ..but why it display that type of character?

can anybody explain to me?