[Java]Problema form

[Luc@s]

import javax.swing.*;
import java.awt.event.*;

class OhmF extends JFrame 
{
    public JButton bToKilo;
	public JButton bToMega;
	public JTextField tMega;
	public JTextField tKilo;
	public JTextField tOhm;
	public JTextField tRis;
	public OhmF()
	{
		// Form
		super.setTitle("Ohm Converter");
		super.getContentPane().add(bToKilo);
		super.getContentPane().add(bToMega);
		super.getContentPane().add(tKilo);
		super.getContentPane().add(tMega);
		super.getContentPane().add(tOhm);
		super.getContentPane().add(tRis);
		super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		// bToKilo
		bToKilo.setText("Convert to Kiloohm");
		bToKilo.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				/* kiloohm = ohm * 1000 */
				tRis.setText(tKilo.getText());				
			}
		});
		bToKilo.enable(true);
		// bToMega
		bToMega.setText("Convert to Megaohm");
		bToMega.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				/* megaohm = ohm * 1000000 */
				tRis.setText(tMega.getText());	
			}
		});
		bToMega.enable(true);
	}
}

class Ohm
{
	public static void main(String[] args)
	{
		OhmF princ = new OhmF();
	}
}

Come mai nn mi campaiono i bottoni e i textafield?


Tnk