probleme ouvrir fenetre via un menu

import javax.swing.*;
 
import java.awt.*;
import java.awt.event.*;
 
publicclass Clients extends JFrame implements ActionListener  {
private JButton bouton;
private JButton bouton1;
private JButton bouton2;
private Container c;
private JFrame maNewFrame2 = null;

public Clients(){
super();
		build();

}

privatevoid build(){
		c = getContentPane();
		c.setLayout(new BorderLayout());


		JMenuBar menuBar = new JMenuBar();
		menuBar.setLayout(new GridLayout(20,1));

		c.add(menuBar, BorderLayout.WEST);

		JMenu menu1 = new JMenu("Tableaux de Bord");

		menuBar.add(menu1);


		menu1.addActionListener(new ActionListener(){
        	@Override
publicvoid actionPerformed(ActionEvent e){
        	      JFrame maNewFrame2 = new maNewFrame2(); 
        	      fermerFenetreActuelle();
        	        maNewFrame2.setVisible(true);   
        	        maNewFrame2.setBounds(0, 0, 800, 600); 
        	        maNewFrame2.setLayout(new FlowLayout()); 
        	        maNewFrame2.setLocationRelativeTo(null); 
        	        maNewFrame2.setTitle("KnowSoft Banking Management"); 			
        	        maNewFrame2.setVisible(true)	;

}
privatevoid fermerFenetreActuelle(){
if(maNewFrame2 != null){
        	        maNewFrame2.dispose();
}
}

});



		setTitle("Clients"); //On donne un titre à l'application
		setSize(900,550); //On donne une taille à notre fenêtre
		setLocationRelativeTo(null); //On centre la fenêtre sur l'écran
		setResizable(false); //On interdit la redimensionnement de la fenêtre


 
}

publicvoid    actionPerformed(ActionEvent e)
{
//quand on a cliqué sur le bouton ici
	        System.out.println("Ici !");
	        JFrame maNewFrame2 = new JFrame();
	        maNewFrame2.setVisible(true);  
	        maNewFrame2.setBounds(0, 0, 400, 200);
	        maNewFrame2.setLayout(new FlowLayout());
	        maNewFrame2.setLocationRelativeTo(null);
	        maNewFrame2.setTitle("KnowSoft Banking Management");
}
publicstaticvoid    main(String args[])
{
new Test();
}

private JPanel buildContentPane(){

		JPanel panel = new JPanel();
		panel.setLayout(new FlowLayout());

		JLabel label = new JLabel("Welcome to KnowSoft Banking Account Management");
		JLabel label1 = new JLabel("by Kahil HAssan");

		panel.add(label);
		panel.add(label1);	
return panel;

}

}