Problemas com mouselistener!

package guj;

import java.awt.BorderLayout;
import java.awt.FlowLayout;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class ExemploJCheckBox extends JFrame {

    private static final long serialVersionUID = 1L;
    private JPanel jContentPane = null;
    private JPanel pnlBotoes = null;
    private JButton btnOK = null;
    private JPanel pnlCheckboxes = null;
    private JCheckBox chkbox001 = null;
    private JCheckBox chkbox002 = null;
    private JCheckBox chkbox003 = null;

    private JPanel getPnlBotoes() {
        if (pnlBotoes == null) {
            pnlBotoes = new JPanel();
            pnlBotoes.setLayout(new FlowLayout());
            pnlBotoes.add(getBtnOK(), null);
        }
        return pnlBotoes;
    }

    private JButton getBtnOK() {
        if (btnOK == null) {
            btnOK = new JButton();
            btnOK.setText("OK");
        }
        return btnOK;
    }

    private JPanel getPnlCheckboxes() {
        if (pnlCheckboxes == null) {
            pnlCheckboxes = new JPanel();
            pnlCheckboxes.setLayout(new BoxLayout(getPnlCheckboxes(), BoxLayout.Y_AXIS));
            pnlCheckboxes.add(getChkbox001(), null);
            pnlCheckboxes.add(getChkbox002(), null);
            pnlCheckboxes.add(getChkbox003(), null);
        }
        return pnlCheckboxes;
    }

    /**
     * Usa actionPerformed (recomendado)
     * 
     * @return javax.swing.JCheckBox
     */
    private JCheckBox getChkbox001() {
        if (chkbox001 == null) {
            chkbox001 = new JCheckBox();
            chkbox001.setText("Checkbox 001 - actionPerformed");
            chkbox001.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent e) {
                    System.out.println("checkbox 001: actionPerformed()");
                }
            });
        }
        return chkbox001;
    }

    /**
     * Usa itemStateChanged
     * 
     * @return javax.swing.JCheckBox
     */
    private JCheckBox getChkbox002() {
        if (chkbox002 == null) {
            chkbox002 = new JCheckBox();
            chkbox002.setText("Checkbox 002 - itemStateChanged");
            chkbox002.addItemListener(new java.awt.event.ItemListener() {
                public void itemStateChanged(java.awt.event.ItemEvent e) {
                    System.out.println("checkbox 002: itemStateChanged()"); // TODO Auto-generated Event stub
                                                                            // itemStateChanged()
                }
            });
        }
        return chkbox002;
    }

    /**
     * Usa stateChanged: isto dispara muitas vezes seguidas, portanto não é aconselhado, a menos que você saiba o que
     * está fazendo.
     * 
     * @return
     */
    private JCheckBox getChkbox003() {
        if (chkbox003 == null) {
            chkbox003 = new JCheckBox();
            chkbox003.setText("Checkbox 003 - stateChanged");
            chkbox003.addChangeListener(new javax.swing.event.ChangeListener() {
                public void stateChanged(javax.swing.event.ChangeEvent e) {
                    System.out.println("checkbox 003: stateChanged()");
                }
            });
        }
        return chkbox003;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                ExemploJCheckBox thisClass = new ExemploJCheckBox();
                thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                thisClass.setVisible(true);
            }
        });
    }

    public ExemploJCheckBox() {
        super();
        initialize();
    }

    private void initialize() {
        this.setSize(300, 200);
        this.setContentPane(getJContentPane());
        this.setTitle("Exemplo JCheckBox");
    }

    private JPanel getJContentPane() {
        if (jContentPane == null) {
            jContentPane = new JPanel();
            jContentPane.setLayout(new BorderLayout());
            jContentPane.add(getPnlBotoes(), BorderLayout.SOUTH);
            jContentPane.add(getPnlCheckboxes(), BorderLayout.CENTER);
        }
        return jContentPane;
    }
}