Widya on Learning

Analisis dan Perancangan Sistem Pelacakan Posisi Bus TRANS JOGJA Berbasis Mobile dan Web Server part4 - hasil implementasi

2011-05-02T02:47:00.000-07:00

Hasil Implementasi
Hasil implementasi ini akan menunjukkan hasil dari aplikasi yang akan dibuat.

Form Olah Data
Form user adalah tempat melihat informasi user, menambah user baru dan mengubah data user. Berikut adalah hasil penerapannya.

Form Pelacakan di Server
Form pelacakan merupakan form yang digunakan untuk melacak posisi user dan melihat informasi seperti halte dan trayek bus.

Informasi Rute
Form cari rute digunakan untuk melihat informasi mengenai rute bus, shelter-shelter yang terdapat pada rute dan kode bus yang beroperasi baik dengan menu index maupun langsung melihatnya di map.

Pelacakan di Client
Hasi; implementasi pelacakan di client difokuskan pada kemampuan menampilkan posisi pada map dan menampilkan informasi shelter dan rute bus.

Analisis dan Perancangan Sistem Pelacakan Posisi Bus TRANS JOGJA Berbasis Mobile dan Web Server part3 - class diagram

2011-05-02T02:24:00.000-07:00

Diagram Kelas
Diagram kelas Sistem Pelacakan Posisi Bus Trans Jogja Berbasis Mobile dan Web Server terdapat 2 jenis diagram kelas yaitu diagram kelas untuk client (handphone) dan diagram kelas untuk server dimana masing-masing diagram sudah terdapat objek, operasi, atribut dan relasi yang dihasilkan tiap objek. Berikut diagram kelas untuk client dan server:

class diagram

Untuk penjelasan mengenai fungsi dari masing masing kelas dan relasi yang terbentuk pada gambar di atas akan diterangkan dengan keterangan di bawah :

Deskripsi kelas untuk sisi client

iTransJogja Sebagai kelas MIDLet/utama terdapat thread untuk splash logo dan form login
ImageLogo Kelas ini sebagai splash logo
Help Kelas dengan extensi alert, menampilkan informasi mengenai content aplikasi
About Kelas dengan extensi alert, menampilkan informasi mengenai aplikasi dan pembuatnya
FormMenu Kelas ini menampilkan menu-menu utama
DataUser Kelas ini sebagai tempat menampilkan dan mengolah data user
MapOfflineCanvas Kelas ini sebagai tempat meload map, menampilkan map, menampilkan KML dan menampilkan posisi user
LibraryGPSSetting Kelas ini untuk mengatur jenis GPS yang akan digunakan sebagai modul pelacakan
DownloadKML Kelas ini digunakan untuk mendownload informasi KML yang disediakan oleh server
KmlList Kelas ini disunakan sebagai penyedia data KML jared(internal KML)
PlaceList Kelas ini digunakan untuk menampilkan semua informasi KML yang telah diletakan di atas map
Parsing Kml Kelas ini digunakan untuk memparsing data kembalian dari server
DataSave Kelas ini digunakan untuk menangani semua kegiatan menyimpan atau mengambil data pada RMS
ListDataSending Sebagai kelas implement yang akan diimplementasikan dalam kelas SendDataToServer
SendDataToServer Kelas ini akan digunakan untuk mengatur semua aktivitas pengiriman dan penerimaan data dari dan ke server
HttpConn Kelas ini digunakan untuk berinteraksi dengan server, bertanggung jawab dalam mengakses data server dan memperoleh kembalian

Deskripsi kelas untuk sisi server

Koneksi Kelas ini digunakan untuk mengakses database server
LogIn Kelas ini digunakan untuk validasi admin sebelum masuk aplikasi
Home Kelas ini digunakan sebagai tempat peletakan semua content aplikasi
iTransMap Kelas ini digunakan untuk menampilkan map, data KML, marking dan tempat pelacakan semua user yang terkoneksi
FormData Kelas ini digunakan sebagai form untuk menampilkan dan mengolah data, baik untuk data user, kml, atau cari jalur
Action Kelas ini digunakan untuk semua jenis manipulasi database aplikasi baik itu proses penambahan, pencarian, pengolahan maupun penghapusan data dalam database server

Analisis dan Perancangan Sistem Pelacakan Posisi Bus TRANS JOGJA Berbasis Mobile dan Web Server part2 - use case

2011-05-02T02:14:00.000-07:00

Identifikasi Kebutuhan Sistem

Aksi identifikasi kebutuhan sistem ini menghasilkan produk diagram use case. Dalam aplikasi ini dapat identifikasi dua aktor yaitu user dan admin. Untuk aktor user dapat menjalankan sedikitnya 6 use case utama yaitu login atau autentikasi ijin menggunakan aplikasi, data inputan pengguna akan dicocokan dengan data user pada basis data server jika cocok maka pengguna dapat menggunakan aplikasi. Kemudian user dapat melakukan pengolahan data diri atau data login yang nantinya akan dikirim ke server.

Kemudian user dapat mulai mengakses tile maps offline yang terdapat pada memory handphone untuk visualisasi lokasi. Setelah map selesai diakses maka user dapat melakukan 3 use case lainnya yaitu, track GPS yakni melihat posisinya sendiri dengan mendapatkan data melalui GPS receiver dan sekaligus akan mengirimkan koordinatnya kepada server. kemudian user dapat melakukan add KML yaitu menaruh informasi-informasi yang dibutuhkan dalam map seperti jalur yang harus dilalui atau letak-letak halte disepanjang rute. Kemudian yang terakhir adalah download KML yaitu user dapat meminta informasi-informasi data kml lain yang tidak tersedia di dalam aplikasi kepada server.

Sedangkan pada sisi admin selain melakukan pelacakan terhadap user juga dapat mengolah basis data server seperti olah data user, jalur, shelter atau kml. Selain itu, admin juga dapat melakukan pencarian data seperti data trayek atau shelter dan dapat menampilkan hasil pencarian ke dalam map. Diagram use case adalah sebagai berikut:

Analisis dan Perancangan Sistem Pelacakan Posisi Bus TRANS JOGJA Berbasis Mobile dan Web Server

2011-05-02T02:01:00.000-07:00

Analysis and Design Position Monitoring System Bus TRANS JOGJA Based Mobile and Web Server

Trans Jogja adalah sistem transportasi bus cepat, murah dan ber-AC di seputar kota Yogyakarta, Indonesia. Trans jogja merupakan salah satu bagian dari program penerapan Bus Rapid Transit (BRT) yang dicanangkan Departemen Perhubungan. Sistem ini mulai dioperasikan bulan Maret 2008 oleh Dinas Perhubungan, pemerintah Provinsi DIY. Moto pelayanannya adalah “Aman, Nyaman, Terjangkau dan Ramah lingkungan”.

Sebagai komponen dari sistem transportasi terpadu bagi kota Yogyakarta dan daerah-daerah pendukungnya, sistem ini menghubungkan enam titik penting moda perhubungan di sekitar kota, diantaranya adalah Stasiun KA Jogjakarta, Terminal Bus Giwangan, Terminal Condong Catur, Bandar Udara Adisucipto, dan Terminal Prambanan. Kecuali Giwangan dan Stasiun Yogyakarta, titik-titik terletak di wilayah Kabupaten Sleman. Terdapat pula halte yang berada di dekat objek wisata serta tempat publik penting seperti sekolah, universitas, rumah sakit, bank, samsat, serta perpustakaan.

Mengingat semakin populer dan sentralnya fungsi dari mode transportasi Trans Jogja ini pelayanan dan fasilitas bus maupun halte juga harus semakin ditingkatkan. Walaupun pelanggan sudah merasa nyaman atas fasilitas bus yang ber-AC dan harga tiket yang relatif murah, tetapi kadang pelanggan juga mengeluhkan tentang fasilitas di halte yang masih belum dilengkapi dengan sistem informasi geografis terkomputerisasi dan dinamis. Pelanggan tidak dapat mengetahui kapan bus selanjutnya akan tiba atau dimana posisi terkini bus yang akan mereka naiki selanjutnya. Untuk itu dibutuhkan sebuah sistem informasi navigasi dan pemantauan posisi terkini dari masing-masing bus yang beroperasi.

Global Positioning System (GPS) merupakan satu-satunya sistem navigasi dan penentuan lokasi berbasis satelit dengan tingkat ketelitan yang tinggi, pada awalnya dikembangkan untuk digunakan oleh militer Amerika Serikat. GPS menggunakan lebih dari 24 satelit komunikasi yang mentransmisikan sinyal ke segala arah setiap saat. Satu penerima GPS dapat menemukan posisinya sendiri dalam beberapa detik dari sinyal satelit GPS dengan ketelitian hingga satu meter akurasi bahkan ketelitian hingga satu sentimeter dapat dicapai oleh unit receiver dengan spesifikasi canggih milik militer. Kemampuan ini telah mengurangi biaya perolehan data khususnya untuk membuat peta, atau hal-hal lain yang berhubungan dengan pemetaan juga meningkatkan akurasi pemetaan (Made, 2008).

Requirements Gathering
Requirements gathering merupakan segmen untuk menganalisis masalah, fungsi dan komponen produk yang akan dibuat dan hasil dari segmen ini adalah sebuah dokumen kebutuhan yang meliputi analisis kebutuhan pengguna, analisis domain, dan identifikasi sistem.

Analisis Kebutuhan Pengguna
Bus Trans Jogja sekarang sudah menjadi moda transportasi terpadu dan sentral di kota Yogyakarta. Jalur dari Trans Jogja ini menghubungkan tempat-tempat setrategis di seputaran kota. Tetapi sampai saat ini masih belum memiliki sebuah sistem pelacakan yang mampu memberikan informasi mengenai rute, halte dan armada yang sedang beroperasi secara realtime. Untuk itu perlu dibangun sebuah aplikasi pelacakan yang berbasis client-server, dimana client/supir bus dapat memperoleh informasi-informasi yang dibutuhkan sekaligus dapat mengetahui posisinya dengan tampilan dalam map. Di sisi lain admin juga dapat secara realtime mengetahui posisi dari masing-masing armada yang beroperasi dan mampu menyediakan informasi-informasi yang dibutuhkan oleh usert.

Analisis Domain
Aplikasi Sistem Pelacakan Posisi Bus Trans Jogja Berbasis mobile dan Web Server ini akan dibangun menggunakan prinsip client-server dimana client (menggunakan teknologi J2ME) akan mengirim dan mengakses data menggunakan handphone, sedangkan server akan menggunakan PHP. Komunikasi antara client dan server dilakukan melalui koneksi via GPRS.
Aplikasi bagi client ini memiliki satu aktor yaitu user (pengendara bus). Dimana user tersebut dapat melihat informasi lokasi dengan tampilan map dan dapat mengakses informasi-informasi yang dibutuhkan. Untuk server sendiri admin sebagai aktor dapat menambah data lokasi atau jalur bus, mengubah data dan menghapus data yang semua diolah ke database. Data-data yang akan dikirim atau diakses oleh client dilakukan melalui koneksi via GPRS sehingga pertukaran informasi dapat dilakukan dengan realtime.

Identifikasi Sistem
Identifikasi sistem yang dibangun akan menampakkan bagian-bagian software yang berjalan pada hardware. Hardware yang nampak secara fisik adalah handphone yang digunakan oleh user/client dan komputer yang akan digunakan oleh admin/server. Untuk software yang digunakan yaitu J2ME. Aplikasi untuk pelacakan posisi armada bus Trans Jogja ini menggunakan J2ME dan PHP terbagi atas dua aplikasi yaitu :

Aplikasi Client
Aplikasi client akan mengirimkan request (permintaan) kepada aplikasi server menggunakan mobile phone berbasis java dengan konektivitas via GPRS melalui WAP Gateway operator telekomunikasi.

Aplikasi Server
Aplikasi server akan menerima request dari client dan menghubungkan ke basis data server, kemudian memproses request tersebut, lalu mengirimkan tanggapan (response) ke client.

My Final Project RELEASE (SISTEM PELACAKAN POSISI BUS TRANS JOGJA BERBASIS MOBILE DAN WEB SERVER)

2011-05-02T01:50:00.000-07:00

POSITION MONITORING SYSTEM BUS TRANS JOGJA
BASED MOBILE AND WEB SERVER

SISTEM PELACAKAN POSISI BUS TRANS JOGJA
BERBASIS MOBILE DAN WEB SERVER

Kadek Widya Kumara
Jurusan Teknik Informatika
STMIK AMIKOM YOGYAKARTA

ABSTRACT

Now, Trans Jogja has been centrally transportation around Yogyakarta city. By having good facilities, comfortable seat, and lower cost is important factors that cause many consumers toward to use Trans Jogja service. However, by increasing the role of Trans Jogja to transport, it also causes consumers demand to more service. One of the important facilities that have never created is tracking system to each bus that still on operation on the way.

Because of that, the researcher tries to make an application that is expected to monitor a bus on operation. Hopefully, this application can provide complete information include route, shelter, and other important information. This tracking application is made by using Java2 Micro Edition for programming script on application mobile, PHP5 on side web server and MySQL as database management system. The system will have web system as its basis for administrator and mobile application for the user, this application uses Google Maps for visualizing the position by GPS receiver as user coordinate receiver. The application is completed by login admin facility and user to protect access right.

The researcher thinks that this application is very useful to people who use Trans Jogja. Bus driver can know his position and information about route and shelter, administrator can monitor position of bus and consumers can look for much information that needed.

Key words: Global positioning System (GPS), Google Maps, Java2 Micro Edition (J2ME), Application Mobile, Web Server

UML Use Case Diagram for GPS Application

2010-05-24T04:11:00.000-07:00

UML Use Case Diagram is :
The use case model captures the requirements of a system.
Use cases are services or functions provided by the system to its users.
A use case is a set of scenarios that describing an interaction between a user and a system.
Use case diagrams model the functionality of a system using actors and use cases.

The two main components of a use case diagram are use cases and actors.

An actor is represents a user or another system that will interact with the system you are modeling.
A use case is an external view of the system that represents some action the user might perform in order to complete a task.

Below is my sample use case for GPS system :
use case for admin side;

use case for client side;

Balinese Art Shop Online

2010-05-01T02:34:00.000-07:00

One tourist destination in the world's most famous is the Bali island (Island of the Gods) besides having an amazing culture and an amazing tourist area. Bali community is also a good craftsmen. if you want to buy art bali products, you can visit the site Balineseartshop.

There you can see the results of the public arts of Bali and can be bought without having to come to Bali.

In this blog I included some photos of the products sold on the website Balineseartshop.

From Balineseartshop

BY ART FROM MY SITE - We are an online art shop that provides various traditional arts of Bali. we are here to offer low prices and excellent customer service. if you want to get the latest information about our products you can log in and become a member of our online art shop. if you become a member you will also get a variety of convenience shipping or discounts from us.

Create J2ME MidLet with Command, List and Alert

2010-04-15T21:54:00.000-07:00

The following is a simple example of creating a Command, List and the Alert in J2ME Midlet. The first thing you should do is install the JDK on the C system, then install the Java ™ Platform Micro Edition Software Development Kit or Netbean built J2ME.

This program that we will create:

list menu :

select one list :

result alert :

The following step program creation :

Step #1 : create all object needed and declare it



public class Menu21 extends MIDlet implements CommandListener{

    //create object needed

    private List mainMenu;

    private List titleFilm;

    private List contactkAdm;

    private List scheduleFilm;

    private Command cmdExit;

    private Command cmdBack;

    private Command cmdSelect;

    private Display display;

    private Alert alert1;

    private Image img = null;



    public Menu21(){

        //declare object

        display = Display.getDisplay(this);

        mainMenu = new List("Theatre21", Choice.IMPLICIT);

        titleFilm = new List("Title", Choice.IMPLICIT);

        contactkAdm = new List("Contact", Choice.EXCLUSIVE);

        scheduleFilm = new List("Schedule", Choice.MULTIPLE);

        cmdBack = new Command("Back", Command.BACK, 1);

        cmdExit = new Command("Exit", Command.EXIT, 2);

        cmdSelect = new Command("Select", Command.SCREEN, 2);

        alert1 = new Alert(null);

        alert1.setTimeout(10000);



    }

Step #2: makes all the objects and fill in the required content in objects startApp ()



public void startApp() {

        //create object icon

        try {

            img = Image.createImage("/small.png");

        }catch(Exception e){

            System.out.println("image null " +e.getMessage());

            img=null;

        }



        //add command to main menu

        mainMenu.addCommand(cmdExit);

        mainMenu.addCommand(cmdPilihl);



        //add list to main menu

        mainMenu.append("Title", img);

        mainMenu.append("contact", img);

        mainMenu.append("Schedule", img);

        mainMenu.append("Info", img);



        //set command main menu

        mainMenu.setCommandListener(this);

        //set main menu as displayable

        display.setCurrent(mainMenu);



    }

Step #3 : Create Command listener



 public void commandAction(Command c, Displayable d) {

        if (c==cmdExit){

            destroyApp(false);

            notifyDestroyed();

        }else if(c==cmdPilihl){

            if(display.getCurrent()==mainMenu){

                evenMainMenu();

            }else if(display.getCurrent()==titleFilm){

                evenTitle();

            }else if(display.getCurrent()==contactkAdm){

                evenContact();

            }else if(display.getCurrent()==scheduleFilm){

                evenSchedule();

            }

        }else if(c==cmdBack){

            display.setCurrent(mainMenu);

        }

    }

Step #4 : Create all Object needed in action listener



    private void evenJudul() {

        int i = titleFilm.getSelectedIndex();

        alert1.setTitle("Title " + titleFilm.getString(i));

        if(titleFilm.getString(i).equals("Avatar")){

            alert1.setString("i think you know about this film...");

        }else if(titleFilm.getSelectedIndex()==1){

            alert1.setString("menceritakan tentang bumi th 2012");

        }else if(titleFilm.getSelectedIndex()==2){

            alert1.setString("i don't know about this film..");

        }else if(titleFilm.getSelectedIndex()==3){

            alert1.setString("story about Gi Joe the 'Bolang'");

        }

        display.setCurrent(alert1);

    }





    private void evenContact() {

        int i = contactkAdm.getSelectedIndex();

        alert1.setTitle(contactkAdm.getString(i)+" kami :\n");

        if(i==0){

            alert1.setString("cieforblack@gmail.com");

        }else if(i==1){

            alert1.setString("cie_78@yahoo.com");

        }else if(i==2){

            alert1.setString("ciefor78@gmail.com");

        }

        display.setCurrent(alert1);

    }



    private void evenSchedule() {

       boolean[] selctSchedule = new boolean[scheduleFilm.size()];       

       int jumpil = scheduleFilm.getSelectedFlags(selectSchedule);

       alert1.setTitle("Schedule 21");



       StringBuffer isi = new StringBuffer("You select "+jumpil+" hari\n");

       for(int i=0;i           if(selectSchedule[i])

           isi.append((i+1)+". hari "+scheduleFilm.getString(i)+"\n");

       }

       

       alert1.setString(isi.toString());

      display.setCurrent(alert1);     

    }



    private void evenMainMenu() {

        if(mainMenu.getSelectedIndex()==0){

            listtitle();

        }else if(mainMenu.getSelectedIndex()==1){

            listContact();

        }else if(mainMenu.getSelectedIndex()==2){

            listSchedule();

        }else if(mainMenu.getSelectedIndex()==3){

            info21();

        }

    }





    private void info21() {

       alert1.setTitle("INFORMATION");

       alert1.setString("Bioskop21 Information\n"

                         +"Name : Widya\n"

                         +"Nim : 07.11.1634");

       

       display.setCurrent(alert1);

    }



    private void listSchedule() {

        jadwalFilm.deleteAll();



        scheduleFilm.addCommand(cmdExit);

        scheduleFilm.addCommand(cmdBack);

        scheduleFilm.addCommand(cmdPilihl);



        scheduleFilm.append("Monday", null);

        scheduleFilm.append("Tuesday", null);

        scheduleFilm.append("Wednesday", null);

        scheduleFilm.append("Thursday", null);

        scheduleFilm.append("Friday", null);

        scheduleFilm.append("Saturday", null);

        scheduleFilm.append("Sunday", null);



        scheduleFilm.setCommandListener(this);

        display.setCurrent(scheduleFilm);

    }



    private void listTitle() {

        try {

            img = Image.createImage("/small.png");

        }catch(Exception e){

            System.out.println("image null " +e.getMessage());

            img=null;

        }



        titleFilm.deleteAll();



        titleFilm.addCommand(cmdExit);

        titleFilm.addCommand(cmdPilihl);

        titleFilm.addCommand(cmdBack);



        titleFilm.append("Avatar", img);

        titleFilm.append("2012", null);

        titleFilm.append("UP IN THE AIR", null);

        titleFilm.append("GI JOE", null);



        titleFilm.setCommandListener(this);

        display.setCurrent(judulFilm);

    }



    private void listContact() {



       contactAdm.deleteAll();

       contactAdm.addCommand(cmdExit);

       contactAdm.addCommand(cmdBack);

       contactAdm.addCommand(cmdSelect);



       contactAdm.append("E-Mail", null);

       contactAdm.append("Facebook", null);

       contactAdm.append("Yahoo", null);



       contactAdm.setCommandListener(this);

       display.setCurrent(contactAdm);

    }

Apple iPad still has some weaknesses

2010-01-29T00:16:00.000-08:00

New tablet computer from Apple, iPad, is a revolutionary device. Steve Jobs, CEO of Apple, even commenting on this device as 'the most important thing' is announced.

content and features that are owned, Apple iPad is quite promising. The device mentioned can have many functions for its users, ranging from e-book reader, video player and even to handheld game consoles.

However, Apple iPad still considered to have some shortcomings. These deficiencies could be a reason for consumers to not rush to adopt Apple's gadget is cool.

What are the drawbacks? according to InformationWeek, following a number of weaknesses in Apple iPad:

No Adobe flash
Not equipped with a camera
Not to multitasking
The screen has a small size, which is 9.7 inches
Not using Mac OS
Storage capacity is not big enough
The battery is not easily replaced
Does not have HDMI port

what with all these shortcomings iPad, this product will still be interested?? we will wait seoak exploits of this great product.

see also :
Apple iPad new technology from Apple

Apple iPad new technology from Apple

2010-01-29T00:04:00.000-08:00

Apple CEO, Steve Jobs announced the latest product named Apple iPad. iPad is probably the latest version of the iPhone, because it has the exact same form with the iPhone.

This technologically advanced device touch screen with dimensions of 9.7 inches and weighs 1.5 pounds. Processors using Apple processor A4 1 GHz. Battery endurance is almost the same as the iPod resistance in general, ie for 10 hours for the use of active and nearly a month when in standby.

iPad is launched in two versions, first version with dibandrol As the price of 499 dollars with 16 GB of memory and one worth 829 U.S. dollars with 65 GB of memory and is equipped with 3G connectivity. but for the both version has been equipped iPad WiFi devices.

For the name, Apple even had to buy the copyright of Fujitsu iPad've used first names for one product.

The function of the iPad was almost the same as the iPhone, ranging from check emails, browsing, streaming from YouTube, see photos and video, iWorks etc. But that became the hallmarks of this iPad is a application to read and direct mendonload aka e-books electronic books from the Internet. To support that, at the same time Apple also opened a new online store, iBook Store.

but these new products sold in the U.S. market. New iPad next 2-3 months will touch another country markets.

see also :
Apple iPad still has some weaknesses

Vespa and sexy girl

2010-01-27T05:57:00.000-08:00

Piaggio aircraft factory during which produces many types of aircraft during World War 2 was destroyed by allied bombers. This company became bankrupt, so that after the world war over this company was taken over by enrico piagio. Because he saw the roads in Italy were destroyed and the economy is bad then he led the company to focus on designing an inexpensive
means of transportation.

Corradino d'Ascanio was an aeronautical engineer who used to designed, built, and flew the first modern helicopter in the world, eventually was asked to reply to design a simple reply of transportation, economical, but also comfortable and elegant D'Ascanio was an engineer who really hate the bike why he designed a revolutionary new product that yg inspired to apply aircraft and aircraft technology (monocoque construction, front-wheel design is also derived from the design of aircraft wheels, for easy replacement tires) even the initial products, is using an aircraft wheel

vespa, the name given enrico himself when he first saw the design the vespa = a kind of Italian bees (Wasp in english)
until now, the design remains the Vespa motorcycle design most sensual truly revolutionary machine simpe step 2

Most structures using aluminum design also considered a completely different motorcycle was considered noisy and uncomfortable

This antique motorcycle enthusiasts are not only men but also women. vespa always look beautiful when integrated with a woman.

vesva antique galery :

a simple client/server source in java

2010-01-26T23:26:00.000-08:00

in building the client / server application we will make two initial source, the server source and the client source for connections to the server.
The following is a simple example of the connection client / server using TCP.

code for the server :


/**
* Tserver.java
* Example server program using TCP.
*/
import javax.swing.*;
public class Tserver {

final static      int   serverPort   = 3456;                      // port server location

public static void main(String args[]) {
java.net.ServerSocket   sock = null;                              // server socket location
java.net.Socket         clientSocket = null;                      // creating socket
java.io.PrintWriter     pw   = null;                              // output soket
java.io.BufferedReader  br   = null;                              // input soket

try {
     sock = new java.net.ServerSocket(serverPort);               // create socket and bind to port
     System.out.println("waiting connection from client..");
     clientSocket = sock.accept();                               // waiting connection from client
     System.out.println("connection successfull");
     pw   = new java.io.PrintWriter
(clientSocket.getOutputStream(),true);
     br   = new java.io.BufferedReader(
new java.io.InputStreamReader(clientSocket.getInputStream()));

     Integer r = Integer.parseInt(br.readLine());             // read message from client
     Double hsl = 3.14 * r * r ;
     //System.out.println("pesan dari client.. >" + hsl);
     JOptionPane.showMessageDialog(null,answer "+hsl);                                      // send response to client

     pw.close();                                                 // closing
     br.close();
     clientSocket.close();
     sock.close();
} catch (Throwable e) {
     System.out.println("Error " + e.getMessage());
     e.printStackTrace();
}
}
}

code for the client :
Java Programming for a Beginner, 5-disk DVD Complete Training Suite. Edition 2009

SOURCE CODE


/**
* Tclient.java
* Example Client program using TCP.
*/
import javax.swing.*;
public class Tclient {

final static  String    serverIPname = "localhost";               // server IP name
final static  int       serverPort   = 3456;                      // port server

public static void main(String args[]) {
java.net.Socket         sock = null;                              // Socket object for connection
java.io.PrintWriter     pw   = null;                              // socket output to server
java.io.BufferedReader  br   = null;                              // socket input from server

try {
     sock = new java.net.Socket(serverIPname,serverPort);        // create socket and connection
     pw   = new java.io.PrintWriter(sock.getOutputStream(), true);  // create reader and writer
     br   = new java.io.BufferedReader(new java.io.InputStreamReader(sock.getInputStream()));
     System.out.println("Koneksi ke server");
     pw.println(JOptionPane.showInputDialog(null,"masukkan nilai r "));                      //send message to server
     System.out.println("sending message to server");
     String answer = br.readLine();                              // get data server
    System.out.println("message from server"+ answer);
     JOptionPane.showMessageDialog(null,"server answer  " + answer);
     pw.close();                                                 // closing
     br.close();
     sock.close();
} catch (Throwable e) {
     System.out.println("Error " + e.getMessage());
     e.printStackTrace();
}
}
}

Foreign Key Constraint in MySql

2009-12-03T00:02:00.000-08:00

InnoDB supports foreign key constraints. The syntax for a foreign key constraint definition in InnoDB looks like this:

[CONSTRAINT [symbol]] FOREIGN KEY
[index_name] (index_col_name, ...)
REFERENCES tbl_name (index_col_name,...)
[ON DELETE reference_option]
[ON UPDATE reference_option]

reference_option:
RESTRICT | CASCADE | SET NULL | NO ACTION

index_name represents a foreign key ID. If given, this is ignored if an index for the foreign key is defined explicitly. Otherwise, if creates an index for the foreign key, it uses index_name for the index name.

Foreign keys definitions are subject to the following conditions:

Both tables must be tables and they must not be TEMPORARY tables.
Corresponding columns in the foreign key and the referenced key must have similar internal data types insideInnoDB so that they can be compared without a type conversion. The size and sign of integer types must be the same. The length of string types need not be the same. For nonbinary (character) string columns, the character set and collation must be the same.
InnoDB requires indexes on foreign keys and referenced keys so that foreign key checks can be fast and not require a table scan. In the referencing table, there must be an index where the foreign key columns are listed as the first columns in the same order. Such an index is created on the referencing table automatically if it does not exist. (This is in contrast to some older versions, in which indexes had to be created explicitly or the creation of foreign key constraints would fail.) index_name, if given, is used as described previously.
InnoDB allows a foreign key to reference any index column or group of columns. However, in the referenced table, there must be an index where the referenced columns are listed as the columns in the same order.
Index prefixes on foreign key columns are not supported. One consequence of this is that BLOB and TEXT columns cannot be included in a foreign key because indexes on those columns must always include a prefix length.
If the CONSTRAINT symbol clause is given, the symbol value must be unique in the database. If the clause is not given, InnoDB creates the name automatically.

InnoDB rejects any INSERT or UPDATE operation that attempts to create a foreign key value in a child table if there is no a matching candidate key value in the parent table. The action InnoDB takes for any UPDATE or DELETE operation that attempts to update or delete a candidate key value in the parent table that has some matching rows in the child table is dependent on the specified using ON UPDATE and ON DELETE subclauses of the FOREIGN KEY clause. When the user attempts to delete or update a row from a parent table, and there are one or more matching rows in the child table, InnoDB supports five options regarding the action to be taken. If ON DELETE or ON UPDATE are not specified, the default action is RESTRICT.

CASCADE: Delete or update the row from the parent table and automatically delete or update the matching rows in the child table. Both ON DELETE CASCADE and ON UPDATE CASCADE are supported. Between two tables, you should not define several ON UPDATE CASCADE clauses that act on the same column in the parent table or in the child table.
Note
Currently, cascaded foreign key actions to not activate triggers.
SET NULL: Delete or update the row from the parent table and set the foreign key column or columns in the child table to NULL. This is valid only if the foreign key columns do not have the NOT NULL qualifier specified. Both ON DELETE SET NULL and ON UPDATE SET NULL clauses are supported.
If you specify a SET NULL action, make sure that you have not declared the columns in the child table as NOT NULL.
NO ACTION: In standard SQL, NO ACTION means no action in the sense that an attempt to delete or update a primary key value is not allowed to proceed if there is a related foreign key value in the referenced table. InnoDB rejects the delete or update operation for the parent table.
RESTRICT: Rejects the delete or update operation for the parent table. Specifying RESTRICT (or NO ACTION) is the same as omitting the ON DELETE or ON UPDATE clause. (Some database systems have deferred checks, andNO ACTION is a deferred check. In MySQL, foreign key constraints are checked immediately, so NO ACTION is the same as RESTRICT.)
SET DEFAULT: This action is recognized by the parser, but InnoDB rejects table definitions containing ON DELETE SET DEFAULT or ON UPDATE SET DEFAULT clauses.

InnoDB supports foreign key references within a table. In these cases, “child table records” really refers to dependent records within the same table.

Here is a simple example that relates parent and child tables through a single-column foreign key:

CREATE TABLE parent (id INT NOT NULL,
PRIMARY KEY (id)
) ENGINE=INNODB;

CREATE TABLE child (id INT, parent_id INT,
INDEX par_ind (parent_id),
FOREIGN KEY (parent_id) REFERENCES parent(id)
ON DELETE CASCADE
) ENGINE=INNODB;

A more complex example in which a product_order table has foreign keys for two other tables. One foreign key references a two-column index in the product table. The other references a single-column index in the customertable:

CREATE TABLE product (category INT NOT NULL, id INT NOT NULL,
price DECIMAL,
PRIMARY KEY(category, id)) ENGINE=INNODB;

CREATE TABLE customer (id INT NOT NULL,
PRIMARY KEY (id)) ENGINE=INNODB;

CREATE TABLE product_order (no INT NOT NULL AUTO_INCREMENT,
product_category INT NOT NULL,
product_id INT NOT NULL,
customer_id INT NOT NULL,
PRIMARY KEY(no),
INDEX (product_category, product_id),
FOREIGN KEY (product_category, product_id)
REFERENCES product(category, id)
ON UPDATE CASCADE ON DELETE RESTRICT,
INDEX (customer_id),
FOREIGN KEY (customer_id)
REFERENCES customer(id)) ENGINE=INNODB;

source mysql.com

League of Legends : DOTA Replacement

2009-11-21T22:21:00.000-08:00

Developer Riot Games announces new MMO game titled League of Legends which combines aspects of role-playing and strategy games popular as DOTA all star. Was released on the public after this game can be a substitute for DOTA? Only time can talk. Welcome to the new round of competitive online gaming.

You will act as a Summoner who can bring a hero to champion the battle. Together with the NPC ally, you must use tactics to defeat the other in a battle Summoner very similar to DotA.

This latest online game, is really similar to DOTA all star, the difference, the DOTA is a mod of warcraft3 while, the League of Legends is an online game actually stand alone.Just like DotA, League of Legends in this, your team will control the Hero in tactics and strategy in defeating the other team's hero.Each hero class has its own unique skills.

For business graphics, new games are obviously better than DotA game that was released many years. But whether this game could replace DOTA??

download league of legends

JAVA MATRIX CALCULATOR

2009-11-21T21:32:00.000-08:00

Java Web Services: Up and Running

No special classes or libraries are used with this application. The complete source resides in the one file above. After downloading, the following should work in any JDK 1.2 compatible compiler:

javac MatrixCalculator.java
java MatrixCalculator

Matrix Calculator Tips/Help

All Matrices must be symmetric (n x n)
Enter Matrix Elements Row by Row seperated by spaces.
Ex. (2x2)


2 4

3 1

Results will be placed in the C matrix.

The calculation of the determinant, by definition, is based upon a factorial number of calculations with respect to the size of the matrix. ie. a 3x3 matrix would have 6 calculations (3!) to make, whereas a 20x20 matrix would have 2.43 x 10^18 calculations (20!). So instead of brute forcing the calculations, I first do some operations on the matrix, which converts it to a upper triangular matrix, and then calculate the determinant by multipling down the diagonal, since everything below is 0, this will give the determinant.

Floating Points and Accuracies

For some reason computers aren't as accurate as I think they are, probably my calculation techniques. The accuracy of the numbers are probably only to 3 maybe 2 decimal places. If you keep applying operations to matrices and then use the resultant matrix a couple of times, the decimals get out of whack. Calculating an inverse and then multplying the matrix by it, is a good example of this.

Test Some Mathematical Theories

The determinant of A-inverse equals 1 over the determinant of A.

If two rows of matrix A are equal, the determinant of A equals 0.

det(A*B)=det(A)det(B)

A*B does not necessarily equal B*A

The determinant of A-transpose equals the determinant of A.

If the matrix B is constructed by interchanging two rows (columns) in matrix A, then the determinant of B equals the negative determinant of A

You can test, adj(A) = det(A) * inv(A), but this is the theorem I use to calculate the inverse, so it better work.

Mathematics and Linear Algebra Calculating the Determinant

So instead of brute forcing the calculations, I first do some operations on the matrix, which converts it to a upper triangular matrix, and then calculate the determinant by multipling down the diagonal, since everything below is 0, this will give the determinant.

See The Mathematics Behind Them for more information and mathematical explanations on the definitions and calculation techniques.

Click the spoiler below for displaying source-code