merci  tarzent mais j'ai un soucis comment faire une actionlistener sur le bouton si je click sur _daysNumber[i]

final JPanel dayPanel = new JPanel();
        dayPanel.setLayout(new GridLayout(7, 7));
        for (int i = 0; i < 7; ++i)
            dayPanel.add(_daysOfWeek[i] = new JLabel("", SwingUtilities.CENTER));
        for (int i = 0; i < _daysNumber.length; ++i)
        dayPanel.add(_daysNumber[i] = new JButton());
         add(dayPanel, BorderLayout.CENTER);