จับการทำงานของ keyboard

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class KeyTest {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Key Listener");
    Container contentPane = frame.getContentPane();
    KeyListener listener = new KeyListener() {
      public void keyPressed(KeyEvent e) {
        dumpInfo("Pressed", e);
      }
      public void keyReleased(KeyEvent e) {
        dumpInfo("Released", e);
      }
      public void keyTyped(KeyEvent e) {
        dumpInfo("Typed", e);
      }
      private void dumpInfo(String s, KeyEvent e) {
        System.out.println(s);
        int code = e.getKeyCode();
        System.out.println("\tCode: " + KeyEvent.getKeyText(code));
        System.out.println("\tChar: " + e.getKeyChar());
        int mods = e.getModifiersEx();
        System.out.println("\tMods: "
            + KeyEvent.getModifiersExText(mods));
        System.out.println("\tLocation: "
            + location(e.getKeyLocation()));
        System.out.println("\tAction? " + e.isActionKey());
      }
      private String location(int location) {
        switch (location) {
        case KeyEvent.KEY_LOCATION_LEFT:
          return "Left";
        case KeyEvent.KEY_LOCATION_RIGHT:
          return "Right";
        case KeyEvent.KEY_LOCATION_NUMPAD:
          return "NumPad";
        case KeyEvent.KEY_LOCATION_STANDARD:
          return "Standard";
        case KeyEvent.KEY_LOCATION_UNKNOWN:
        default:
          return "Unknown";
        }
      }
    };
    JTextField text = new JTextField();
    text.addKeyListener(listener);
    contentPane.add(text, BorderLayout.NORTH);
    frame.pack();
    frame.show();
  }
}