Tutorial 1: Download and Install Development Software

Overview on this Tutorial:

1. Overview of Java Compilation
2. Download J2SE 1.5.0 SDK
3. Download TextPad 4.7.3
4. Run "HelloWorld" Console Program for J2SE
5. Download J2ME Wireless Toolkit 2.2
6. Run Sample Program for J2ME.
7. Run "HelloWorld" Console Program for J2ME

Overview of Java Compilation:

Below is a flow chart of how the Java code written being transformed to a running program.

• Editor
  We write Java source code in an editor. There are many choices of editors, ranging from simple ones like Notepad to complex ones like Textpad.
• Compiler
  After the source code is written, we need to translate it to things understood by the Java Interpreter, this process is done by the compiler. The compiler will output a .class file with the same name as the .java file.
• Interpreter
  This is when all the required class files being brought together to run the program. Notice some class files are brought from the library.

Download J2SE 1.5.0 SDK:

To compile and run java, we firstly need to download the standard development kit (SDK) for J2SE (Java 2 Platform Standard Edition). The latest version of J2SE is 1.5.0.

To download, visit: http://java.sun.com/j2se/1.5.0/download.jsp, then

1. Click "Download JDK 5.0 Update 6".

2. Select "Windows Offline Installation, Multi-language".

3. Execute the file "jdk-1_5_0_06-windows-i586-p.exe" to install.

Download TextPad 4.7.3:

After downloading J2SE SDK, you can compile and run J2SE programs. However, there is no windows interface for edit source code, compile and run. To meet these needs, we suggest to use Textpad.

To download TextPad 4.7.3, visit: http://www.textpad.com/download/index.html.

In the download page, you can choose "English Only".

After installing TextPad, if necessary, click "Configure -> Preference -> Tools -> Add -> Java SDK Commands".

Run "HelloWorld" Console Program for J2SE:

After installing and configuring Textpad, we can edit, compile and run J2SE standard programs using TextPad.

1. Open TextPad.

2. Type the source code as follows and save it as "HelloWorld.java", or download the file "HelloWorld.java".

3. Press "Ctrl+1" to compile.

4. Press "Ctrl+2" to run the program.

You can see the string "Hello World!" is printed out.

Download J2ME Wireless Toolkit 2.2:

Now, you can use Textpad to write J2SE programs. However, our goal is to write Java 2 Platform Standard Edition (J2ME) programs for mobile phones. Originally, you have to download CLDC 1.1 and MIDP 2.0 for developing J2ME programs for mobile phones. Now, you can simply download J2ME Wireless Toolkit 2.2 which includes CLDC 1.1, MIDP 2.0 and interfaces to compile and run J2ME program.

To download J2ME Wireless Toolkit 2.2, visit: http://java.sun.com/products/j2mewtoolkit/download-2_2.html, then

1. Click "Download" at the bottom of the page.

2. Accept "Licence Agreement".

3. Select "Windows Platform" to download.

4. Execute the file "j2me_wireless_toolkit-2_2-windows.exe" to install.

Run Sample Program for J2ME.

Now you can run sample J2ME programs. The steps are as follows:

1. Launch the "ktoolbar" in the J2ME Wireless Toolkit.

2. Click "Open Project".

3. Select a Project to open (says "Games").

4. Click "Run".

Run "HelloWorld" Console Program for J2ME

In order to develop your own Program, you should know how to create a new Project using "ktoolbar". The steps to create a very simple project for a "HelloWorld" program is a follows:

1. Launch the "ktoolbar" in the J2ME Wireless Toolkit.

2. Click "New Project".

3. Type "Basics1" in both text boxes for "Project Name" and "Midlet Class Name".

4. Click "Create Project" and click "OK".

5. You can see a sentence saying that the location of "Java source files".

6. Download the file "Basics1.java" and save to that location (something like "C:\WTK22\apps\Basics1\src").

7. Click "Build" to compile.

8. Click "Run" to execute the program.

You will see the string "Hello World!" in the console after you click the "Launch" button in the mobile phone.