import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class KeyCodeExample extends MIDlet
{
  private Display  display;       
  private MyCanvas canvas;   
  public KeyCodeExample ()
  {
    display = Display.getDisplay(this);
    canvas  = new MyCanvas(this);
  }
  protected void startApp()
  {
    display.setCurrent(canvas);
  }
  protected void pauseApp()
  { 
  }
  protected void destroyApp( boolean unconditional )
  { 
  }
  public void exitMIDlet()
  {
    destroyApp(true);
    notifyDestroyed();
  }
}
class MyCanvas extends Canvas implements CommandListener
{
  private Command exit;          
  private String direction;
  private KeyCodeExample keyCodeExample;
  public MyCanvas (KeyCodeExample keyCodeExample)
  {
    direction = "2=up 8=dn 4=lt 6=rt";    
    this.keyCodeExample = keyCodeExample;
    exit = new Command("Exit", Command.EXIT, 1);
    addCommand(exit);
    setCommandListener(this);
  } 
  protected void paint(Graphics graphics)
  {
    graphics.setColor(255,255,255);
    graphics.fillRect(0, 0, getWidth(), getHeight());
    graphics.setColor(255, 0, 0);
    graphics.drawString(direction, 0, 0, 
                         Graphics.TOP | Graphics.LEFT);
  }
  public void commandAction(Command command, Displayable displayable)
  {
    if (command == exit)
    {
      keyCodeExample.exitMIDlet();
     }
  }
  protected void keyPressed(int key)
  {
    switch ( key ){
     case KEY_NUM2:
       direction = 搖p