MIDP spesification membutuhkan minimal 8kB yang telah dipesan sebagai persistence storage. Sebuah MIDlet yang menggunakan RMS akan menspesifikasikan beberapa byte yang dibutuhkan, ukuran ini ditentukan dalam JAR manifest dan application descriptor (JAD) menggunakan MIDlet-Data-Size.
Contoh penggunaan Record Management System dengan menggunakan software Netbeans:
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import javax.microedition.rms.*;
import javax.microedition.midlet.*;
import java.io.*;
public class RMSTugas extends MIDlet implements CommandListener{
private Display display;
private List list;
private Command cmdKeluar;
private Command cmdKembali, cmdHasil, cmdbalik, cmdSimpan;
private TextField soal1, soal2, soal3, soal4, soal5, id;
private Form form;
int nilai1, nilai2, nilai3, nilai4, nilai5;
int Nakhir;
private RecordStore rs;
private RecordEnumeration re;
private Alert alert;
public RMSTugas() {
form = new Form("MENU UTAMA");
cmdKeluar = new Command("Keluar", Command.EXIT, 0);
cmdKembali = new Command("Kembali", Command.BACK, 1);
cmdbalik = new Command("Kembali", Command.BACK, 1);
cmdHasil = new Command("Hasil", Command.OK, 2);
cmdSimpan = new Command("Simpan", Command.OK, 2);
alert = new Alert(null);
alert.setTimeout(Alert.FOREVER);
list = new List(null, Choice.IMPLICIT);
rs = null;
// membuat atau membuka record store
try
{
rs = RecordStore.openRecordStore("db_KodeBar", true);
}
catch (RecordStoreException rse) //check kalau error = exception
{
alert.setString("Record store tidak dapat dibuka. " +"Aplikasi akan dihetikan");
alert.setType(AlertType.ERROR);
display.setCurrent(alert, null);
System.exit(1);
}
}
public void startApp() {
display = Display.getDisplay(this);
display.setCurrent(form);
menuList();
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
notifyDestroyed();
}
public void menuList(){
list = new List("MENU UTAMA", List.IMPLICIT);
list.append("UJIAN", null);
list.append("Nilai Tertinggi", null);
list.append("Keluar", null);
list.setCommandListener(this);
display.setCurrent(list);
}
public void UJIAN(){
form = new Form("UJIAN");
soal1 = new TextField("1. 2+3 = ?", "", 100, TextField.DECIMAL);
soal2 = new TextField("2. 8/2 = ?", "", 100, TextField.DECIMAL);
soal3 = new TextField("3. 3*4 = ?", "", 100, TextField.DECIMAL);
soal4 = new TextField("4. 7-3 = ?", "", 100, TextField.DECIMAL);
soal5 = new TextField("5. (7-3)*2 = ?", "", 100, TextField.DECIMAL);
form.append(soal1);
form.append(soal2);
form.append(soal3);
form.append(soal4);
form.append(soal5);
form.setCommandListener(this);
form.addCommand(cmdKembali);
form.addCommand(cmdHasil);
display.setCurrent(form);
}
public void nama(){
form = new Form("SIMPAN HASIL");
id = new TextField("Masukkan nama anda : ","", 100, TextField.ANY);
form.append(id);
form.setCommandListener(this);
form.addCommand(cmdSimpan);
form.addCommand(cmdbalik);
display.setCurrent(form);
}
public void commandAction(Command c, Displayable d) {
if (c == cmdKeluar){
destroyApp(true);
}
if(c.getLabel()=="Simpan"){
alert.setType(AlertType.INFO);
if (!id.equals(null)) //cek jika var ada isi nya
{
tambahRecord(id.getString());
alert.setString("Data lengkap !, Data sudah disimpan di RMS, untuk melihat gunakan pilihan menu'nilai tertinggi' pada menu utama");
display.setCurrent(alert);
display.setCurrent(alert, list);
}
else //jika data kosong
{
alert.setString("Data Kurang !, isikan nama anda terlebih dahulu.");
display.setCurrent(alert, form);
}
}
if(c.getLabel()=="Nilai Tertinggi"){
lihatRecord();
}
else if (c == cmdHasil){
nama();
}
else if (c == cmdbalik){
UJIAN();
}else if (c == cmdKembali){
menuList();
}else{
List menu = (List) display.getCurrent();
switch (menu.getSelectedIndex()){
case 0:
UJIAN();
break;
case 1:
lihatRecord();
break;
case 2:
destroyApp(true);
}
}
}
public void tambahRecord(String id)
{
int a = Integer.parseInt(soal1.getString());
int b = Integer.parseInt(soal2.getString());
int c = Integer.parseInt(soal3.getString());
int d = Integer.parseInt(soal4.getString());
int e = Integer.parseInt(soal5.getString());
if(a == 5){
a=2;
}
else if(a != 5){
a=0;
}
if(b==4){
b=2;
}
else if(b != 4){
b=0;
}
if(c==12){
c=2;
}
else if(c != 12){
c=0;
}
if(d==5){
d=2;
}
else if(d !=2 ){
d=0;
}
if(e==10){
e=2;
}
else if(e != 10){
e=0;
}
Nakhir = a + b + c + d + e;
byte[] temp = null;
try
{
//kosntruktor baos dan dos
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
//cari fungsi ini ByteArrayOutputStream dan DataOutputStream di internet
dos.writeUTF(id);// tulis var pada dos
dos.writeInt(Nakhir);
temp = baos.toByteArray();
}
catch (IOException ioe)
{
ioe.printStackTrace();
}
try
{
rs.addRecord(temp, 0, temp.length); //masukan data pada RecordStore
} catch (RecordStoreNotOpenException rsnoe) {
rsnoe.printStackTrace();
} catch (RecordStoreException rse) {
rse.printStackTrace();
}
}
public void lihatRecord() {
byte[] temp = null;
list.setTitle("Nilai Tertinggi");
list.deleteAll();
try
{
re = rs.enumerateRecords(null, null, false); //enumerasi record
while (re.hasNextElement()) //jk elemen rs lbh dr satu
{
int i = re.nextRecordId();
temp = rs.getRecord(i);
ByteArrayInputStream bais = new ByteArrayInputStream(temp);
DataInputStream dis = new DataInputStream(bais);
try
{
String id = dis.readUTF();
//Integer Nakhir = dis.readUTF();
list.append(id + " = "+ Nakhir +" \n",null);// tampilkan
}
catch (IOException ioe) {ioe.printStackTrace();}
}
list.addCommand(cmdKembali);
list.setCommandListener(this);
display.setCurrent(list);
}
catch (InvalidRecordIDException invID) {invID.printStackTrace();}
catch (RecordStoreNotOpenException rsnoe) {rsnoe.printStackTrace();}
catch (RecordStoreException rse) {rse.printStackTrace();}
}
}
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