LoginFormApplication (Login Form + Aplikasi Nilai) dengan Menggunakan Aplikasi Sun Java

Assalamuallaikum Wr. Wb.
Pada Kali ini , Job pertama yang dibahas pada pembelajaran Praktik Pemrograman Jaringan Komputer yaitu tentang Bagaimana LoginFormApplication (Login Form + Aplikasi Nilai) .

LoginFormApplication dapat dipergunakan untuk dapat masuk ke user lalu bisa mengetahui matakuliah, SKS dan nilai melalui aplikasi Sun Java .

Berikut adalah contoh program dari LoginFormApplication (Login Form + Aplikasi Nilai) :

PROGRAM LoginFormApplication

Username       : gita

Password        : 12345

import javax.microedition.midlet.MIDlet;

import javax.microedition.lcdui.*;

public class LoginFormApplication 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 LoginFormApplication() {

    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("gita") && password.equals("12345")) {

        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);

}

    }

}

Bisa Anda download file nya secara lengkap disini : LoginFormApllication (Login Form + Aplikasi Nilai)