import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class ButtonTester_P12_3
{  
    public static void main(String[] args)
    {  
        JFrame frame = new JFrame();
        JButton button = new JButton("Button A");
        
        ActionListener listener = new ClickListener_P12_3();
        button.addActionListener(listener);

        JButton button2 = new JButton("Button B");

        ActionListener listener2 = new ClickListener_P12_3();
        button2.addActionListener(listener2);

        JPanel panel = new JPanel();
        panel.add(button);
        panel.add(button2);
        frame.add(panel);

        frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    private static final int FRAME_WIDTH = 100;
    private static final int FRAME_HEIGHT = 110;
}