Konversi Desimal ke Biner, Hexa, Oktal di j2me

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package modul3_tugas;

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

/**
 * @author teguh-supriyanto
 */

public class _konversiNilai extends MIDlet implements CommandListener {
private Form form;
private TextField textField;
private TextField textField2;
private TextField textField3;
private TextField textField4;
private Display display;
private Command cmdKeluar;
private Command cmdAksi;
private Alert alert;
public String strNama;


public _konversiNilai() {
form = new Form("Form Konversi DesBin");
textField  = new TextField("Input Desimal :", "", 10, 0);
textField2 = new TextField("Hasil Biner :", "", 10, 0);
textField3 = new TextField("Hasil Octa :", "", 10, 0);
textField4 = new TextField("Hasil Hexa :", "", 10, 0);
cmdAksi   = new Command("Konversi", Command.SCREEN, 1);
cmdKeluar = new Command("Keluar", Command.SCREEN, 2);
form.addCommand(cmdKeluar);
form.addCommand(cmdAksi);
form.append(textField);
form.append(textField2);
form.append(textField3);
form.append(textField4);
form.setCommandListener(this);
}

public void startApp(){
display = Display.getDisplay(this);
display.setCurrent(form);
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
    }

    public void commandAction(Command c, Displayable d) {
try{

int hex = Integer.parseInt(textField.getString());
       if (d == form) {
           if (c == cmdKeluar) {
               destroyApp(false);
               notifyDestroyed();
}
else if (c == cmdAksi) {
                textField2.setString("" +Integer.toBinaryString(hex));
                textField3.setString("" +Integer.toOctalString(hex));
                textField4.setString("" +Integer.toHexString(hex));
  }
  }
  }

  catch (Exception e){
              alert = new Alert("pesan");
                alert.setString("masukkan salah/kosong!! cuma angka, bukan abjad !!");
                display.setCurrent(alert);
        }


  }
   }