mi tarea profe no puedo mandarlo mañana

CODIGO:
import java.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import javax.microedition.midlet.*;
public class Principal extends MIDlet implements CommandListener {
    Display display = null;

    private String url = "http://extremadamenteeinnecesariamentelargo.web44.net/docs/datos-borrego";
    private String url2 = "http://extremadamenteeinnecesariamentelargo.web44.net/docs/Opcion";

    List menu = null;
    TextBox input = null;
    TextBox t=null;
    static final Command backCommand = new Command("Back", Command.BACK, 0);
    static final Command mainMenuCommand = new Command("Main", Command.SCREEN,1);
    static final Command exitCommand = new Command("Exit", Command.STOP, 2);
    String currentMenu = null;
    public Principal() { }
    public void startApp() throws MIDletStateChangeException { display = Display.getDisplay(this);
    menu = new List("Menu Items", Choice.IMPLICIT);
    menu.append("Datos", null);
    menu.append("opcion", null);


    menu.addCommand(exitCommand);
    menu.setCommandListener(this);
    mainMenu();

    }
    public void download (String url) throws IOException{
        StringBuffer b= new StringBuffer();
        InputStream is=null;
        HttpConnection c=null;

        try {
            long len =0;
            int ch=0;

            c= (HttpConnection)Connector.open(url);
            is = c.openInputStream();
            while ((ch=is.read()) !=-1){
                b.append((char)ch);
            }
            t = new TextBox("Hola..." ,b.toString(), 2024,0);
            t.addCommand(backCommand);

            t.setCommandListener(this);

          } finally {
              if(is !=null)
                  is.close();
              if(c !=null)
                  c.close();
          }

          display.setCurrent(t);

    }
    public void pauseApp() {
        display = null;
        menu = null;
        input = null;
    }
    public void destroyApp(boolean unconditional) {

        notifyDestroyed();
    }
    void mainMenu() {
        display.setCurrent(menu);
        currentMenu = "Main";
    }
    public void testIteml() {
        display = Display.getDisplay(this);
        try{
            download(url);
        } catch(IOException e){
            System.out.println("IOException" + e);
        }
    }
    public void testItem2() {
         display = Display.getDisplay(this);
        try{
            download(url2);
        } catch(IOException e){
            System.out.println("IOException" + e);
        }
    }


            public void commandAction(Command c, Displayable d) {
            String label = c.getLabel();
            if (label.equals("Exit")) {
            destroyApp(true);
            }
            if (label.equals("Back")) {
                mainMenu();
                if(currentMenu.equals("Datos generales") ||
                   currentMenu.equals("Informacion Adicional")  ) {


                }
            } else {
                List down = (List)display.getCurrent();
                switch(down.getSelectedIndex()) {
                case 0: testIteml();break;
                case 1: testItem2();break;


            }
    }
    }
 }