[java][applet][débutant]Affichage

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

import java.io.IOException;
import java.net.Socket;



public class MainPing extends JPanel implements ActionListener
{
	
	private JTextArea affichage;
	private JButton bouton;
	private JPanel pannel;
	private JFrame fenetre;


	MainPing()
	{
		//super.setLayout(new GridLayout(3,1));
		bouton = new JButton("Ping It");
		affichage = new JTextArea("",10,30);
		
		
		bouton.addActionListener(this);
		
		add(bouton);
		add(affichage);


	}
	
    public void actionPerformed(ActionEvent e) 
    {
    	pingIt();
    }
    

	public void pingIt()
	{
		long start =0, stop = 0;		
		Socket socket = null;
		
		for(int i=0; i<10; i++)
		{
			try 
			{
				start = System.currentTimeMillis();
				socket = new Socket("www.free.fr", 80);
				stop = System.currentTimeMillis();
												
				Debug("Socket opened in "+(stop-start)+" ms.    ");
			}
			catch (Exception e)
			{
				Debug("Site is not there.\n");
			}
			finally 
			{
				try
				{
					if (socket != null)
					socket.close();
					Debug(" Closing socket ...\n");
					Thread.sleep(2000);
				} 
				catch (IOException e) {	}
				catch (InterruptedException e) { }
				
			}
			
		}
	}
	
	public void Debug(String message)
	{
		affichage.append(message);
	}
    
    private static void createAndShowGUI() 
    {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);
        

        //Create and set up the window.
        JFrame fenetre = new JFrame("JPing");
        fenetre.setSize(400,500);
        //fenetre.pack();
        fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        MainPing newContentPane = new MainPing();

        newContentPane.setOpaque(true); //content panes must be opaque
        fenetre.setContentPane(newContentPane);

        //Display the window.
        
        fenetre.show();
        fenetre.setVisible(true);
    }    
    
    
    
    public static void main(String[] args) 
    {
		createAndShowGUI(); 
    }	
	
}