[Java] erreur dans le code??

else if e.getSource() != celibataire 

else

package com.jeu.test;
import java.awt.*;
import java.awt.event.*;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JRadioButton;

// si le bouton coché est celibataire alors resultat est bravo!!

public class Jeu extends JFrame implements ActionListener {
	public static final String MESSAGE_BRAVO = "Bravo !";
	public static final String DEFAULT_MESSAGE = "mauvaise reponse niark niark";
	private Container c;
	private JRadioButton marie;
	private JRadioButton divorce;
	private JRadioButton celibataire;

	public Jeu() {
		super("Jeu");
		initialize();
	}

	private void initialize() {
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		c = getContentPane();
		c.setLayout(new FlowLayout());
		c.setBounds(100, 100, 250, 150);
		ButtonGroup btnGp = new ButtonGroup();
		marie = new ChoiceButton("marié");
		btnGp.add(marie);
		divorce = new ChoiceButton("divorcé");
		btnGp.add(divorce);
		celibataire = new ChoiceButton("celibataire");
		btnGp.add(celibataire);
		c.add(marie);
		c.add(divorce);
		c.add(celibataire);
	}

	public void actionPerformed(ActionEvent e) {
		String message = DEFAULT_MESSAGE;
		if (e.getSource() == celibataire) {
			message = MESSAGE_BRAVO;
		}
		JOptionPane.showMessageDialog(null, message);
	}

	class ChoiceButton extends JRadioButton implements ActionListener {
		public ChoiceButton(String label) {
			super(label);
			addActionListener(this);
		}

		public void actionPerformed(ActionEvent ae) {
			String message = DEFAULT_MESSAGE;
			if (ae.getSource() == celibataire) {
				message = MESSAGE_BRAVO;
			}
			JOptionPane.showMessageDialog(null, message);
		}
	}

	public static void main(String[] args) {
		JFrame f = new Jeu();
		f.pack();
		f.setVisible(true);
	}
}