import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class SwingApplication extends JFrame implements ActionListener
{
   int numClicks = 0;
   JLabel label = new JLabel("Número de clics de botones: " + numClicks);
   JPanel pane = new JPanel();
   JButton button = new JButton("¡Soy un botón Swing!");

   SwingApplication ()
   {
      super ("SwingApplication");
      button.addActionListener (this);
      pane.setLayout(new GridLayout(0, 1));
      pane.add(button);
      pane.add(label);
      this.getContentPane().add(pane, BorderLayout.CENTER);
   }

   public static void main(String[] args) 
   {
      SwingApplication frame = new SwingApplication ();
      frame.addWindowListener (new WindowAdapter() {
        public void windowClosing (WindowEvent e)
        {
           System.exit(0);
        }
      } );
      
      frame.pack();
      frame.setVisible(true);
   }

   public void actionPerformed (ActionEvent e)
   {
      numClicks ++;
      label.setText ("Número de clics de botones: " + numClicks);
   }
}