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

public class Fond {
	public static void main(String[] args) {
		try {
			try {
				UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
			} catch (ClassNotFoundException e) {
			}
		} catch (InstantiationException e2) {	
		} catch (IllegalAccessException e3) {
		} catch (UnsupportedLookAndFeelException e4) {
		} // On constate que les boutons changent d'apparence 
		catch (ClassCastException e5) {
			System.out.println("Nom de manager incorrect");
		} // Les boutons restent comme avant

		JFrame fenetre = new JFrame();
		fenetre.setSize(300,200);
		fenetre.setLocation(100,100);
		fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		fenetre.setLayout(new GridLayout(1, 1));

		JPanel panneau = new JPanel();

		JButton bouton1 = new JButton("Cyan");
		JButton bouton2 = new JButton("Magenta");
		JButton bouton3 = new JButton("Jaune");

		bouton1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evenement) {
				panneau.setBackground(Color.CYAN);
			}
		});

		bouton2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evenement) {
				panneau.setBackground(Color.RED);
			}
		});

		bouton3.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evenement) {
				panneau.setBackground(Color.MAGENTA);
			}
		});

		panneau.add(bouton1);
		panneau.add(bouton2);
		panneau.add(bouton3);

		fenetre.add(panneau);
		fenetre.setVisible(true);
	}
}