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

public class KeyerClicker
{
    static JButton button = new JButton ("");
    
    public static void main (String[] args)
    {
	JFrame frame = new JFrame ("KeyerClicker");
	frame.getContentPane().add (button, BorderLayout.CENTER);
	
	button.addActionListener (new ActionListener() {
		public void actionPerformed (ActionEvent e) 
		{
		    button.setText ("click");
		}
	    });
	
	button.addKeyListener (new KeyAdapter() {
		public void keyTyped (KeyEvent e)
		{
		    char c = e.getKeyChar();
		    button.setText (String.valueOf (c));
		}
	    });
	button.requestFocusInWindow ();
	
	frame.addWindowListener(new WindowAdapter() {
		public void windowClosing (WindowEvent e) { System.exit(0); }
	    });
	frame.pack ();
	frame.setVisible(true);
    }
}