Membuat Menu ChoiceGroup J2ME

Buku.java

/*
 *@ author Resa C.R 
 */
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class Buku extends MIDlet implements CommandListener
{
	private Display tampil;
	private Ticker runText,runTextTampil;
	private Form form,formTampil;
	private TextField txtNoKTP;
	private TextField txtNama;
	private ChoiceGroup choiceBuku;
	private ChoiceGroup choiceJudul;
	
	private Command comKeluar,comOk,comKembali;
	
	
	public Buku()
	{
		runText = new Ticker("<<<Selamat Datang di rental buku online>>>");
		txtNoKTP = new TextField("No.KTP","",15,TextField.NUMERIC);
		txtNama  = new TextField("Nama","",30,TextField.ANY);
		
		//check Box (multi select)
		choiceBuku = new ChoiceGroup("Kategori Buku",Choice.MULTIPLE);
		choiceBuku.append("Religi",null);
		choiceBuku.append("Komputer",null);
		choiceBuku.append("Bisnis",null);
		
		//radio button (pilih salah satu)
		choiceJudul = new ChoiceGroup("Judul Buku",Choice.EXCLUSIVE);
		choiceJudul.append("Doa Membawa Berkah <Religi>",null);
		choiceJudul.append("Java Programming <Komputer>",null);
		choiceJudul.append("30 Menit Meraih Sukses <Bisnis>",null);
		choiceJudul.append("Daripada wira - wiri mending Wirausaha <Bisnis>",null);
		choiceJudul.append("Database <Komputer>",null);
		
		comKeluar = new Command("Keluar",Command.EXIT,2);
		comOk = new Command("OK",Command.OK,2);
		
		
	}
	
	public void startApp()
	{
		tampil = Display.getDisplay(this);
		form = new Form("Aplikasi Peminjaman Buku via Mobile Phone");
		
		form.append(txtNoKTP);
		form.append(txtNama);
		form.append(choiceBuku);
		form.append(choiceJudul);
		form.addCommand(comKeluar);
		form.addCommand(comOk);
		
		form.setCommandListener(this);
		form.setTicker(runText);
		
		tampil.setCurrent(form);
	}
	
	public void pauseApp()
	{
		
	}
	
	public void destroyApp(boolean unconditional)
	{
		notifyDestroyed();
	}
	
	public void Keluar()
	{
		destroyApp(true);
	}
	
	public void Tampilkan()
	{
		StringItem sNoKTP = new StringItem("",txtNoKTP.getString());
		StringItem sNama = new StringItem("",txtNama.getString());
		String strBuku = "";
		if(choiceBuku.isSelected(0))
		{
			strBuku = choiceBuku.getString(0);
		} 
		else if(choiceBuku.isSelected(1))
		{
			strBuku = strBuku + " , " + choiceBuku.getString(1);
		}
		else if(choiceBuku.isSelected(2))
		{
			strBuku = strBuku +  " , " + choiceBuku.getString(2);
		}
		
		StringItem sBuku = new StringItem("","Kategori Buku : " + strBuku);
		StringItem sJudulBuku = new StringItem("","Judul Buku : " + choiceJudul.getString(choiceJudul.getSelectedIndex()));
		
		formTampil = new Form("Data Peminjaman Buku");
		runTextTampil = new Ticker("visit www.marisharingilmu.wordpress.com");
		comKembali = new Command("Kembali",Command.BACK,2);
		comKeluar = new Command("Keluar",Command.EXIT,2);
		
		formTampil.append(sNoKTP);
		formTampil.append(sNama);
		formTampil.append(sBuku);
		formTampil.append(sJudulBuku);
		formTampil.addCommand(comKembali);
		formTampil.addCommand(comKeluar);
		formTampil.setTicker(runTextTampil);
		formTampil.setCommandListener(this);
		tampil.setCurrent(formTampil);
		
	}
	public void commandAction(Command com,Displayable dsp)
	{
		String label = com.getLabel();
			if(label.equals("OK"))
			{
				Tampilkan();
			}
			else if(label.equals("Kembali"))
			{
				tampil.setCurrent(form);
			}
			else if(label.equals("Keluar"))
			{
				destroyApp(true);
				notifyDestroyed();
			}
		
	}
	
	
}