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

    	public class Fond implements ActionListener
    	{
    		public static JButton bouton1, bouton2, bouton3;
    		private JPanel panneau;
    		public Fond() {
    			JFrame fenetre = new JFrame();
    			fenetre.setSize(300, 300);
    			fenetre.setLocation(100, 100);
    			fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    			panneau = new JPanel();
    			bouton1 = new JButton("Cyan");
    			bouton1.addActionListener(this);
    			bouton2 = new JButton("Magenta");
    			bouton2.addActionListener(this);
    			bouton3 = new JButton("Jaune");
    			bouton3.addActionListener(this);
    			panneau.add(bouton1);
    			panneau.add(bouton2);
    			panneau.add(bouton3);
    			fenetre.add(panneau);
    			fenetre.setVisible(true);
    		}
    		public void actionPerformed(ActionEvent e)
    		{
    			Object source = e.getSource();
    			if (source == bouton1)
    			{
    				panneau.setBackground(Color.CYAN);
    			}
    			else if (source == bouton2)
    			{
    				panneau.setBackground(Color.MAGENTA);
    			}
    			else if (source == bouton3)
    			{
    				panneau.setBackground(Color.YELLOW);
    			}
    			panneau.repaint();
    		}	
			public static void main(String[] args)
    		{
    			new Fond();
    		}
    	}