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

public class KeyChecker2 extends JFrame {
    JLabel keyLabel = new JLabel("Hit any key");

    public KeyChecker2() {
         super("Hit a Key");
         setSize(300, 200);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setLayout(new FlowLayout(FlowLayout.CENTER));
         KeyAdapter monitor = new KeyAdapter() {
             public void keyTyped(KeyEvent event) {
                 keyLabel.setText("" + event.getKeyChar());
                 repaint();
             }
         };
         setFocusable(true);
         addKeyListener(monitor);
         add(keyLabel);
         setVisible(true);
     }

     private static void setLookAndFeel() {
         try {
             UIManager.setLookAndFeel(
                 "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"
             );
         } catch (Exception exc) {
             System.err.println("Couldn't use the system "
                 + "look and feel: " + exc);
         }
     } 

     public static void main(String[] arguments) {
         KeyChecker2.setLookAndFeel();
         new KeyChecker2();
     }
 }