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