Java: Faire disparaître et reapparaître un composant

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math, list, méthode, list, set, swing, awt, JPanel, JFrame
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import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.awt.BorderLayout;
 
 
public class FadeComponent extends JFrame
{ 
    public FadeComponent()
    {
    	JFrame f = new JFrame("Effet Fondu en java");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(250, 200);
        JPanel pnl=new JPanel();
        pnl.add(new FadingButton("Cliquez ici pour me faire disparître")
        		, BorderLayout.SOUTH);
        f.add(pnl);
        f.setVisible(true);
    }
	public static void main(String argv[]) 
    {
        Runnable showMyGUI = new Runnable() {
            public void run() {
                new FadeComponent();
            }
        };
        SwingUtilities.invokeLater(showMyGUI);
    }
}
class FadingButton extends JButton implements ActionListener {
 
  float alpha = 1.0f;
  Timer timer; 
  int dureeAnimation = 5000; 
  long animationStartTime;
  BufferedImage btnImage = null;
 
  public FadingButton(String btnTexte) {
    super(btnTexte);
    setOpaque(false);
    timer = new Timer(30, this);
    addActionListener(this);
  }
     /*
      * Cette méthode gère les cliques
      * de lancement et d'arrêt de l'animation
      */
  public void actionPerformed(ActionEvent ae) {
    if (ae.getSource().equals(this)) {
      // Démarrer l'animation
      if (!timer.isRunning()) {
        animationStartTime = System.nanoTime() / 1000000;
        this.setText("Stopper l'animationn");
        timer.start();
      } else {
        timer.stop();
        this.setText("Démarrer l'animation");
        alpha = 1.0f;
      }
    } else {
      long currentTime = System.nanoTime() / 1000000;
      long totalTime = currentTime - animationStartTime;
      if (totalTime > dureeAnimation) {
        animationStartTime = currentTime;
      }
      float fraction = (float) totalTime / dureeAnimation;
      fraction = Math.min(1.0f, fraction);
      alpha = Math.abs(1 - (2 * fraction));
      repaint();
    }
  }
 
  public void paint(Graphics g) {
    if (btnImage == null || btnImage.getWidth() != getWidth()
        || btnImage.getHeight() != getHeight()) {
      btnImage = getGraphicsConfiguration().createCompatibleImage(getWidth(), getHeight());
    }
    Graphics gButton = btnImage.getGraphics();
    gButton.setClip(g.getClip());
    super.paint(gButton);
    Graphics2D g2d = (Graphics2D) g;
    AlphaComposite newComposite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha);
    g2d.setComposite(newComposite);
    g2d.drawImage(btnImage, 0, 0, null);
  }
 
 
}

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