import java.awt.*; import javax.swing.*; import java.awt.event.*; public class Fond extends JPanel implements ActionListener{ public Fond() { super(); JButton magenta = new JButton("magenta"); JButton cyan = new JButton("cyan"); JButton jaune = new JButton("jaune"); this.add(magenta); this.add(cyan); this.add(jaune); magenta.addActionListener(this); cyan.addActionListener(this); jaune.addActionListener(this); } public void actionPerformed(ActionEvent evenement){ String commande = new String(); commande="cyan"; if(true==commande.equals(evenement.getActionCommand())){ this.setBackground(Color.CYAN); } commande="magenta"; if(true==commande.equals(evenement.getActionCommand())){ this.setBackground(Color.MAGENTA); } commande="jaune"; if(true==commande.equals(evenement.getActionCommand())){ this.setBackground(Color.YELLOW); } } }