import javax.swing.JComponent;
import java.awt.Graphics;
 
public class Bonjour extends JComponent {
  @Override
  protected void paintComponent(Graphics pinceau) {
    Graphics secondPinceau = pinceau.create();
    if (this.isOpaque()) {
      secondPinceau.setColor(this.getBackground());
      secondPinceau.fillRect(0, 0, this.getWidth(), this.getHeight());
    }
    
    secondPinceau.setColor(new Color.BLUE);
    secondPinceau.drawRect(20,20, 50, 50);

    secondPinceau.setColor(new Color.GREEN);
    secondPinceau.fillOval(80, 20, 50, 50);

    secondPinceau.setColor(new Color.BLACK);
    secondPinceau.drawString(140, 20, 50, 50)
  }
}