import java.awt.event.*;
import javax.swing.*;
import java.awt.Container;
import java.awt.Font;

public class Button1
{
    public static void main(String[] args)
    {
        BFrame frame= new BFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.show();
    }
}

class BFrame
    extends JFrame
{
    public BFrame()
    {
        setTitle("Ejemplo de Button");
        setSize(XSIZE, YSIZE);
        ButtonPanel panel= new ButtonPanel();
        Container contentPane= getContentPane();
        contentPane.add(panel);
    }
    public static final int XSIZE= 200;
    public static final int YSIZE= 200;
}

class ButtonPanel
    extends JPanel
    implements ActionListener
{
    public ButtonPanel()
    {
        JButton countButton= new JButton("Avanzar cuenta");
        countLabel=  new JLabel("Cuenta= 0");
        Font fontShow= new Font("Monospaced", Font.BOLD, 24);
        countLabel.setFont(fontShow);
        countButton.setFont(fontShow);
        add(countButton);
        add(countLabel);
        countButton.addActionListener(this);    
    }
    
    public void actionPerformed(ActionEvent e)
    {
        i++;
        countLabel.setText("Cuenta= " + i);
        repaint();
    }
    private int i= 0;
    private JLabel countLabel;
}