J2ME error to get value from variable in another class

Question

hi,,
i write code for a mobile application like a tour guide..
i had create 5 class for this application, KutaBeachDictionary MIDlet class, ListMainMenu List class, ListMenuHotel List class, HotelDes01 Form class and the last Hotel class that store all information.
the problem is, i have [choose] variable in ListMenuHotel that contain getSelectedIndex() value, i want to take [choose] value from ListMenuHotel class to [index] variable in HotelDes01, so it determine the name of hotel that will display in form.but the index always 0 although i had choosen different menu from ListMenuHotel..
here is all code
in MIDlet class
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.MIDlet;
public class KutaBeachDictionary extends MIDlet {
    public KutaBeachDictionary() {
        lstMenuUtama = new ListMenuUtama(this);
        lstMenuHotel = new ListMenuHotel(this);
        htlDes1 = new HotelDes01(this);
        frmLoading = new FormLoading(this);
    public Display getDisplay() {
        return Display.getDisplay(this);
    public void exitMIDlet() {
        switchDisplayable(null, null);
        destroyApp(true);
        notifyDestroyed();
    public void startApp() {
        if (midletPaused) {
            resumeMIDlet();
        } else {
            initialize();
            startMIDlet();
        midletPaused = false;
        getDisplay().setCurrent(frmLoading);
        new Thread(frmLoading).start();
        frmLoading.done = false;
        frmLoading.gLoading.setValue(0);
    public void pauseApp() {
        midletPaused = true;
    public void destroyApp(boolean unconditional) {
    private boolean midletPaused = false;
    public ListMenuHotel lstMenuHotel;
    public ListMenuRestaurant lstMenuRestaurant;
    ListMenuUtama lstMenuUtama;
    FormAbout frmAbout;
    public HotelDes01 htlDes1;
    FormLoading frmLoading;
}the code in ListMenuHotel
import java.io.IOException;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.Ticker;
public class ListMenuHotel extends List implements CommandListener {
    Hotel objHotel = new Hotel();
    ListMenuHotel(KutaBeachDictionary run) {
        super("List Hotel", List.IMPLICIT);
        this.run = run;
        try {
            btnImage = Image.createImage("/btnImage.png");
        } catch (IOException e) {
        tickerMenu = new Ticker("Daftar Hotel di Pantai Kuta Bali");
        setTicker(tickerMenu);
        for (int i = 0; i < objHotel.namaHotels.length; i++) {
            append(objHotel.namaHotels, btnImage);
addCommand(new Command("Select", Command.OK, 0));
addCommand(new Command("Back", Command.BACK, 0));
setCommandListener(this);
public void commandAction(Command cmd, Displayable dsp) {
if (cmd == SELECT_COMMAND) {
choose = getSelectedIndex();
Display.getDisplay(run).setCurrent(run.htlDes1);
switch (cmd.getCommandType()) {
case Command.BACK:
Display.getDisplay(run).setCurrent(run.lstMenuUtama);
break;
public int getChoose() {return choose;}
private KutaBeachDictionary run;
private Image btnImage;
private Ticker tickerMenu;
private int choose;
the code in HotelDes01 Form classimport java.io.IOException;
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.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
public class HotelDes01 extends Form implements CommandListener {
private KutaBeachDictionary run;
private int index;
private Hotel isiHotel = new Hotel();
public HotelDes01(KutaBeachDictionary run) {
super("Inna Kuta Hotel");
index = run.lstMenuHotel.getChoose(); //here is the problem..the value remain 0 althought i choose another??!!
this.run = run;
Image imgHotel = null;
String namaHotel = "\n" + isiHotel.namaHotels[index] + "\n";
try {
imgHotel = Image.createImage("/HotelImage/interface/htlDes1.png");
} catch (IOException e) {
append(new ImageItem(null, imgHotel, ImageItem.LAYOUT_CENTER, null));
append(namaHotel);
addCommand(new Command("Back", Command.BACK, 0));
setCommandListener(this);
public void commandAction(Command cmd, Displayable dsp) {
switch (cmd.getCommandType()) {
case Command.BACK:
Display.getDisplay(run).setCurrent(run.lstMenuHotel);
break;
can someone fix the code,, i had tried so many ways,,but completely failure.. T_T
Edited by: diaca on Mar 22, 2010 7:55 AM
Edited by: diaca on Mar 22, 2010 8:01 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

Answer 1

hei bro,i had solved the problem :)
the problem is , i had constructed the form of hotelDes01 each time the program starting with this code
public class KutaBeachDictionary extends MIDlet {
    public KutaBeachDictionary() {
        //.. declaring several new object
        htlDes1 = new HotelDes01(this);
    //..another procedure like startApp, pauseApp, etc
public HotelDes01 htlDes1;
}i think if i declare this class in the beginning it never updated the index value
so i delete the code above, and i declare the htlDes1 in the listMenuHotel like this:
public class ListMenuHotel extends List implements CommandListener {
    //..several code just like before
public void commandAction(Command cmd, Displayable dsp) {
        if (cmd == cmdSelect) {
           objHotel.setChoose(getSelectedIndex()); //i change the code like this
           showInformation();
        if (cmd == cmdBack) {
            Display.getDisplay(run).setCurrent(run.lstMenuUtama);
    public void showInformation() {
        HotelDescription htlDes1 = new HotelDescription(run); //reconstruct the object in the class ListMenuHotel
        Display.getDisplay(run).setCurrent(htlDes1); //display the object
    }so the form of hotelDes01 now always reconstruct whenever user change the election in ListMenuHotel class and now index value get updated.. :D
thanks for trying to fix the code qnat..
this is my coursework, so i get to finish it ASAP..