Memperoleh nilai properti sistem pada JAVA (J2ME)

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

public class PropertiSistem extends MIDlet
  implements CommandListener {
   
  private Display display;
  private Form form;
  private StringBuffer sb;

  private final Command cmdKeluar =
    new Command("Keluar", Command.EXIT, 1);
 
  public PropertiSistem() {
    display = Display.getDisplay(this);
   
    form = new Form("Properti Sistem");
       
    form.addCommand(cmdKeluar);
    form.setCommandListener(this);   
  }
   
  public void startApp() {
    sb = getSystemProperties();
    StringItem si = new StringItem(null, sb.toString());
    form.append(si);
    display.setCurrent(form);
  }
   
  public void pauseApp() {
  }
   
  public void destroyApp(boolean unconditional) {
  }
   
  public void commandAction(Command c, Displayable s) {
    if (c == cmdKeluar) {
      destroyApp(false);
      notifyDestroyed();
    }   
  }
 
  private StringBuffer getSystemProperties() {
    StringBuffer temp = new StringBuffer();
    temp.append("Versi JTWI: " +
        System.getProperty("microedition.jtwi.version"));
    temp.append("\nKonfigurasi: " +
        System.getProperty("microedition.configuration"));
    temp.append("\nProfil: " +
        System.getProperty("microedition.profiles"));
    temp.append("\nLokal: " +
        System.getProperty("microedition.locale"));
    temp.append("\nPlatform: " +
        System.getProperty("microedition.platform"));
    temp.append("\nModel ponsel: " +
        System.getProperty("device.model"));
    temp.append("\nVersi Software: " +
        System.getProperty("software.version"));
    temp.append("\nEncoding: " +
        System.getProperty("microedition.encoding"));
    temp.append("\nPort Komunikasi: " +
        System.getProperty("microedition.commports"));
    return temp;
  }
}