Problema com variavel

public class Lobby extends MIDlet implements CommandListener, Runnable {

         String url;(jah tentei inicializa-la com public e static)
....

           public void commandAction(Command command, Displayable displayable) {
           ... os comandos de case e tal

           case 29:                     
                       url="j2me.datamazon.com/arquivosdl/ijustcalled.txt";
           break;

            ...}

           public void run() {
           ...
           aqui eu uso a variavel mas ela fica com valor nulo em vez de ficar com o site
           SC = (StreamConnection)Connector.open("http://"+url);
           ...
            }
...
}

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;


public class Teste extends MIDlet implements CommandListener {

	private String url="www.MeuSiteDefault.com.br";
	private Form a;
	private Display tela;
	private Command sair,ok;
	
	public Teste() {
		tela = Display.getDisplay(this);
		a = new Form("meu form");
		sair = new Command("sair",Command.EXIT,1);
		ok = new Command("ok",Command.OK,1);
		a.addCommand(sair);
		a.addCommand(ok);
		a.setCommandListener(this);
	}

	public void commandAction(Command c, Displayable display){
		if(display == a){
			if(c == sair){
				destroyApp(true);
				notifyDestroyed();
			}else{
				int numero = 1; //mude esse numero pra simular o case
				switch (numero) {
				case 1:
					minhaURL("www.guj.com.br");
					break;
				case 2:
					minhaURL("www.sun.com");
					break;
				case 3:
					minhaURL("www.java.com");
					break;
				case 4:
					minhaURL("www.jaison.org");
					break;
	
				}
			}
		}
	}
	protected void destroyApp(boolean arg0) {


	}

	protected void pauseApp() {


	}

	protected void startApp() throws MIDletStateChangeException {
		tela.setCurrent(a);
		System.out.println(url);
	}
	
	public void minhaURL(String urlsite){
		System.out.println(urlsite);
	}
}