Probleme 2eme bouton en Java

Bonjour,

Mon deuxieme bouton ne fonctionne pas pourquoi ?

Voici le code :


/*
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* and open the template in the editor.
*/
package fenetre;

import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;

/**
*
* @author
*/
public class Fenetre extends JFrame implements ActionListener
{
private JButton bouton;
private JButton bouton2;
public Fenetre()
{
this.setTitle("ma fenetre");
this.setSize(320,480);
Container c=this.getContentPane();
c.setLayout(null);
bouton = new JButton("Calcul Arrondi");
bouton.setBounds(75,90,120,30);
bouton2 = new JButton("Calul HT");
bouton2.setBounds(75,150,120,30);
bouton.addActionListener(this);
c.add(bouton);
c.add(bouton2);
}
public void ActionPerformed(ActionEvent e)
{
if((JButton)e.getSource()==bouton)
{
new NouvelFenetre().setVisible(true);
this.setVisible(false);
}
else if((JButton)e.getSource()==bouton2)
{
new NouvelFenetre().setVisible(true);
this.setVisible(false);
}
}

public static void main(String [] args)
{
Fenetre fen=new Fenetre();
fen.setVisible(true);
}

@Override
public void actionPerformed(ActionEvent e) {
if((JButton)e.getSource()==bouton)
{
new NouvelFenetre().setVisible(true);
this.setVisible(false);
}
}
}

Merci pour la réponse,