My first JavaME program aka Hello, World on Mobile phone
I wanted to try the JavaME framework. And I tried it.
The first program I made was a simple program which shows an alert box with the text you entered.
Interesting point is that the menu buttons look different then in my “Sony Ericsson K550i”. In the emulator – the “Exit” is on the right, but in my mobile phone it’s on the left. At the moment I don’t have any idea why, but… Well, we’ll see 
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.midlet.*;
/**
* @author Ernestas Kardzys
*/
public class Midlet extends MIDlet implements CommandListener {
private Display display;
private Form mainForm;
private TextBox textBox;
private Command quitCommand;
private Command backCommand;
private Command alertCommand;
private Command textboxCommand;
/**
* Called by the system to start our MIDlet.
*/
public void startApp() {
display = Display.getDisplay(this);
quitCommand = new Command("Exit", Command.EXIT, 1);
backCommand = new Command("Back", Command.BACK, 1);
alertCommand = new Command("Alert", Command.SCREEN, 2);
textboxCommand = new Command("Show textbox", Command.SCREEN, 3);
mainForm = new Form("Main form!");
mainForm.addCommand(quitCommand);
mainForm.addCommand(alertCommand);
mainForm.addCommand(textboxCommand);
mainForm.setCommandListener(this);
textBox = new TextBox("SimpleTextBox", "", 100, 0);
textBox.setCommandListener(this);
textBox.addCommand(alertCommand);
textBox.addCommand(backCommand);
textBox.setCommandListener(this);
display.setCurrent(mainForm);
}
/**
* Called by the system to pause our MIDlet.
*/
public void pauseApp() {
}
/**
* Called by the system to end our MIDlet.
*/
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command choice, Displayable displayable) {
if (choice == quitCommand) {
destroyApp(false);
notifyDestroyed();
}
else if (choice == backCommand) {
display.setCurrent(mainForm);
}
else if (choice == textboxCommand) {
display.setCurrent(textBox);
}
else if (choice == alertCommand) {
if (textBox.getString().trim().length() > 0) {
Alert alert = new Alert(textBox.getString());
alert.setTimeout(5000);
textBox.setString("");
display.setCurrent(alert);
}
}
}
}
The next message in the JavaME section will be about how to send the SMS by using your mobile phone and JavaME
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