Key Frame in Java Swing Example

import javax.swing.*; 
 import java.awt.*; 
 import java.awt.event.*; 
 public class KeyFrameJavaExample extends JFrame implements KeyListener 
 { 
        private JLabel prmpt = new JLabel("Type Something in the TextBox"); 
        private JLabel OutPutLbl = new JLabel("Key Typed:"); 
        private JTextField TxtFld = new JTextField(10); 
        public KeyFrameJavaExample() 
          { 
              setTitle("Key Frame in Java Swing"); 
              setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
              setLayout(new BorderLayout()); 
              add(prmpt, BorderLayout.NORTH); 
              add(TxtFld, BorderLayout.CENTER); 
              add(OutPutLbl, BorderLayout.SOUTH); 
              addKeyListener(this); 
              TxtFld.addKeyListener(this); 
         } 
              public void keyTyped(KeyEvent e) 
                { 
                   char c = e.getKeyChar(); 
                   OutPutLbl.setText("Last Character you Typed : " + c); 
                } 
                   public void keyPressed(KeyEvent e) 
                     { 
                     } 
                      public void keyReleased(KeyEvent e) 
                         { 
                           } 
                      public static void main(String[] args) 
                            { 
                                  KeyFrameJavaExample keyFrame = new KeyFrameJavaExample(); 
                                      final int WIDTH = 250; 
                         final int HEIGHT = 100; 
                                  keyFrame.setSize(WIDTH, HEIGHT); 
                                  keyFrame.setVisible(true); 
                            } 
   }