Membangun aplikasi nilai disertai Login menggunakan program JAVA

halooo...
postingan berikut ini saya akan menjelaskan cara membuat aplikasi nilai disertai dengan login.
cekidottt,,,,

bahan :
1. software Wireless Toolkit 2.5.2
2. Program Java
3. PC

Langkah-Langkah
1. buka software  Wireless Toolkit 2.5.2

2. buat project baru dengan nama login, atur target flatform JTWI, dan configurations CLDC 1.1, klik ok, lalu minimize dulu sofware Wireless Toolkit 2.5.2

3. Tulis program login.Java dibawah ini  pada notepad, lalu simpan di C:\Users\nama user\j2mewtk\2.5.2\apps\login\src

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

public class login extends MIDlet implements CommandListener{
private Display display;
private TextField userName,password;
public Form form;
private Command login,cancel;
private Image img, imge, img2;
Command cmdExit,cmdBack,cmdHitung;
Display dis;
Form frmInput,frmOutput;
TextField tfMakul,tfNilai;
StringItem siMakul,siSKS,siNilai,siGrade,siBobot;
ChoiceGroup cg1;
public login() {
form = new Form("Sign in");
userName = new TextField("LoginID:", "", 30, TextField.ANY);
password = new TextField("Password:", "", 30, TextField.PASSWORD);
cancel = new Command("Cancel", Command.CANCEL, 2);
login = new Command("Login", Command.OK, 2);
try{
img = Image.createImage("/logo.png");
imge = Image.createImage("/gagal.png");
img2 = Image.createImage("/sukses.png");
}catch(Exception e){
System.out.println(e.getMessage());
}
cmdExit = new Command("Keluar",Command.EXIT,0);
cmdBack = new Command("OK",Command.SCREEN,0);
cmdHitung = new Command("Proses",Command.SCREEN,0);
cg1=new ChoiceGroup("SKS",Choice.EXCLUSIVE);
cg1.append("2 SKS",null);
cg1.append("4 SKS",null);
cg1.append("6 SKS",null);
frmInput=new Form("Form Input");
tfMakul = new TextField("Mata Kuliah","",30,TextField.ANY);
tfNilai = new TextField("Nilai","",30,TextField.NUMERIC);
frmInput.append(tfMakul);
frmInput.append(cg1);
frmInput.append(tfNilai);
frmInput.addCommand(cmdExit);
frmInput.addCommand(cmdHitung);
frmInput.setCommandListener(this);
frmOutput=new Form("Form Output");
siMakul=new StringItem("Mata Kuliah","");
siSKS=new StringItem("SKS","");
siNilai=new StringItem("Nilai","");
siGrade=new StringItem("Grade","");
siBobot=new StringItem("Bobot Nilai",null);
frmOutput.append(siMakul);
frmOutput.append(siSKS);
frmOutput.append(siNilai);
frmOutput.append(siGrade);
frmOutput.append(siBobot);
frmOutput.addCommand(cmdBack);
frmOutput.setCommandListener(this);
}
public void startApp() {
display = Display.getDisplay(this);
try{form.append(img);}catch(Exception e){}
form.append(userName);
form.append(password);
form.addCommand(cancel);
form.addCommand(login);
form.setCommandListener(this);
display.setCurrent(form);
}
public void pauseApp() {}
public void destroyApp(boolean unconditional) {
notifyDestroyed();
}
public void validateUser(String name, String password) {
if (name.equals("rina") && password.equals("123")) {   // ganti user dan password
showMsg();
} else {
tryAgain();
}
}
public void showMsg() {
dis = Display.getDisplay(this);
dis.setCurrent(frmInput);
}
public void tryAgain() {
Alert error = new Alert("Login salah", "coba lagi", imge, AlertType.ERROR);
error.setTimeout(900);
error.setImage(imge);
userName.setString("");
password.setString("");
display.setCurrent(error, form);
}
public void commandAction(Command c, Displayable d) {
String label = c.getLabel();
if(label.equals("Cancel")) {
destroyApp(true);
} else if(label.equals("Login")) {
validateUser(userName.getString(), password.getString());
}
if(c==cmdBack){
dis.setCurrent(frmInput);
}else if(c==cmdHitung){
int nilai,nilaigrade,bobotnilai,sks;
siMakul.setText(tfMakul.getString());
if(cg1.isSelected(0)){
siSKS.setText("2 SKS");
sks=2;
}else if(cg1.isSelected(1)){
siSKS.setText("4 SKS");
sks=4;
}else{
siSKS.setText("6 SKS");
sks=6;
}
siNilai.setText(tfNilai.getString());
nilai=Integer.parseInt(tfNilai.getString());
if(nilai<=49){
siGrade.setText("E");
nilaigrade=0;
}else if(nilai<=59){
siGrade.setText("D");
nilaigrade=1;
}else if(nilai<=74){
siGrade.setText("C");
nilaigrade=2;
}else if(nilai<=80){
siGrade.setText("B");
nilaigrade=3;
}else{
siGrade.setText("A");
nilaigrade=4;
}
bobotnilai=sks*nilaigrade;
siBobot.setText(Integer.toString(bobotnilai));
dis.setCurrent(frmOutput);
}else if(c==cmdExit){
destroyApp(false);
notifyDestroyed();
}else{
dis.setCurrent(frmInput);
}
}
}

4. setelah itu , kita buka lagi software Wireless Toolkit 2.5.2 lalu klik build
5. setelah berhasil di build,  pada menu  project > package > create package  . langkah tahap ke  5 ini untuk membuat format jar agar bisa terdeteksi di hp java.
6. selanjutnya  klik run, maka akan muncul tampilan  seperti gambar dibawah ini

Sekarang Aplikasi login+nilai dengan menggunakan program java sudah berhasil kita buat.
 silahkan copy file jar  yang ada di C:\Users\nama user\j2mewtk\2.5.2\apps\login\bin
ke Hp anda yang bisa menginstal aplikasi berformat jar seperti NOKIA dll.
Terima kasih