Memperoleh ukuran layar ponsel pada JAVA (J2ME)

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class UkuranLayar extends MIDlet
  implements CommandListener {
   
  private Display display;
  private CurrentScreen canvas;

  private final Command cmdKeluar =
    new Command("Keluar", Command.EXIT, 1);
 
  public UkuranLayar() {
    display = Display.getDisplay(this);   
    canvas = new CurrentScreen();
    canvas.addCommand(cmdKeluar);
    canvas.setCommandListener(this);
  }
   
  public void startApp() {
    display.setCurrent(canvas);
  }
   
  public void pauseApp() {
  }
   
  public void destroyApp(boolean unconditional) {
  }
   
  public void commandAction(Command c, Displayable s) {
    if (c == cmdKeluar) {
      destroyApp(false);
      notifyDestroyed();
    }   
  }
 
  // inner class
  class CurrentScreen extends Canvas {
    public void paint(Graphics g) {
      int width = getWidth();
      int height = getHeight();
         
      // membersihkan layar dengan warna putih
      g.setColor(0xffffff);
      g.fillRect(0,0, width, height);
         
      Font font = g.getFont();
      int fontHeight = font.getHeight();
      String s = "Ukuran layar: " + width + " x " + height;
      int fontWidth = font.stringWidth(s);
        
      g.setColor(0,0,0);
      g.setFont(font);
      g.drawString(s, (width - fontWidth) / 2,
                      (height - fontHeight) / 2,
                       g.TOP | g.LEFT);
    }
  }
}