Creating a MIDP/CLDC Application

1. Choose File > New Project (Ctrl+Shift+N). Under Categories, select Mobility. Under Projects, select MIDP Application and click Next.
2. Enter MyHello in the Project Name field. Use the default Project Location, or change it to the directory you prefer on your system. In this tutorial we refer to this directory as $PROJECTHOME.
3. Check the Set as Main Project and Create Hello MIDlet check boxes (both are checked by default). Click Next.
4. Select the Sun Java Wireless Toolkit 2.52 for CLDC as the Emulator Platform and use the remaining defaults. Click Next.
5. Click Finish. The IDE creates the $PROJECTHOME/MyHello project folder. The project folder contains all of your sources and project metadata, such as the project Ant script. The application itself is displayed in the Flow Design window of the Visual Mobile Designer.



Note: for a complete description of the available palette components, please refer to the Visual Mobile Designer Palette Reference.

Editing the Java Source Code

Now let's edit the text displayed by the MIDlet.

1. Click on Screen. This opens the Screen Designer window, and displays the Device screen, which is the only screen available in the application.
2. In the Properties window, click in the Text field and type in some new text. In this example we typed "Make my day".



3. The Screen view displays a preview of the text you enter in the Text field.

Compiling and Running the Project

1. Choose Run > Run Main Project (F6) from the Run menu. Follow the progress of the project compilation in the Output window. Note that the HelloMIDlet.java file is built before it is executed. A device emulator opens to display the results of the executed MIDlet. The default device emulator is DefaultColorPhone.
2. In the device emulator window, click on the button below the Launch command. The device emulator launches the MIDlet and displays the text you entered in the source code.



3. Click on the button below Exit to close the MIDlet. Then click on the button in the upper right corner of the device to close the emulator window.

Creating a New Java ME MIDP Project

1. Choose File > New Project (Ctrl-Shift-N). Under Categories, select Mobility. Under Projects, select MIDP Application and click Next.
2. Enter MyHelloMIDlet in the Project Name field (note that "MID" is in upper case letters). Use the default Project Location, or change it to the directory you prefer on your system. We refer to this directory as $PROJECTHOME in this tutorial.
3. Check the Set as Main Project checkbox and remove the check from the Create Hello MIDlet checkbox. Click Next.
4. Select the Sun Java Wireless Toolkit 2.52 for CLDC as the Emulator Platform and use the remaining defaults. Click Next.
5. Expand "Configuration templates provided by installed CLDC platforms" and "Sun Java Wireless Toolkit 2.52 for CLDC " folders. Check the boxes next to each of the configurations. The IDE automatically creates a new project configuration for each template listed.
6. Click Finish. The IDE creates the $PROJECTHOME/MyHelloMIDlet project folder. The project folder contains all of your sources and project metadata, such as the project Ant script.
7. Right-click the MyHelloMIDlet node in the Explorer window and choose New > MIDlet
8. Enter HelloMIDlet as the MIDlet name (note that "MID" is in upper case letters by default). Click Finish. The HelloMIDlet.java file is created and the source code is displayed in the IDE's Editor window.
9. Click in the Source Editor and change

   public class HelloMIDlet extends MIDlet

   to

   public class HelloMIDlet
   extends MIDlet implements javax.microedition.lcdui.CommandListener
   {

10. Add the following text before the startApp() method:

        private void initialize() {
            javax.microedition.lcdui.Display.getDisplay(this).setCurrent(get_helloTextBox());
        }
    
        public void commandAction(javax.microedition.lcdui.Command command, javax.microedition.lcdui.Displayable displayable) {
            if (displayable == helloTextBox) {
                if (command == exitCommand) {
                    javax.microedition.lcdui.Display.getDisplay(this).setCurrent(null);
                    destroyApp(true);
                    notifyDestroyed();
                }
            }
        }
    
        private javax.microedition.lcdui.TextBox get_helloTextBox() {
            if (helloTextBox == null) {
                helloTextBox = new javax.microedition.lcdui.TextBox(null, "Make My Day", 120, 0x0);
                helloTextBox.addCommand(get_exitCommand());
                helloTextBox.setCommandListener(this);
            }
            return helloTextBox;
        }
    
        private javax.microedition.lcdui.Command get_exitCommand() {
            if (exitCommand == null) {
                exitCommand = new javax.microedition.lcdui.Command("Exit", javax.microedition.lcdui.Command.EXIT,
                        1);
            }
            return exitCommand;
        }
        javax.microedition.lcdui.TextBox helloTextBox;
        javax.microedition.lcdui.Command exitCommand;
    

11. Add a line initialize(); to the startApp() method, so it looks like the following:

      public void startApp() {
    initialize();
    }
    

Editing the Java Source Code

Now let's add some text for our MIDlet to display.

1. In the get_helloTextBox() method, replace the "test string" code with the text of your choice. For example, "Make my day."

Note: For a complete guide to using the Java Source Editor in NetBeans see Java Editing in NetBeans IDE.

Compiling and Running the Project

1. Choose Run > Run Main Project (F6) from the Run menu. Follow the progress of the project compilation in the Output window. Note that the HelloMIDlet.java file is built before it is executed. A device emulator opens to display the results of the executed MIDlet. The default device emulator is DefaultColorPhone.
2. In the device emulator window, click on the button below the Launch command. The device emulator launches the HelloMIDlet and displays the text you entered in the source code.