Program Java Mobile Sederhana (tugas 1)

Actually my teacher gave this homework since Tuesday, but because I have lots of work to do such as go to library and find some books reference for my paper, so this homework have to wait.

I remember there's some saying that don't judge a book by it's cover, and don't judge my program by it's title. It says that simple program, but I need 2 hours to complete it. So, here is the code and you can try it. I hope this will help all of you that still learn about Java Mobile.

package hello;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
 * @author ACER
 */
public class Tgs extends MIDlet implements CommandListener {

    Display display;
    Form newsForm;
    StringItem newsString;
    Command exitCommand = new Command("Exit", Command.EXIT, 1);
    Command whyCommand = new Command("Why", Command.OK, 1);
    Command backCommand = new Command("Back", Command.BACK, 1);
    Alert news;
    public Tgs() 
    {
        newsString = new StringItem("Hello Lois! ","Welcome to Java Mobile Programming");
        newsForm = new Form("Hello World", new Item[] { newsString});
        newsForm.addCommand(exitCommand);
        newsForm.addCommand(whyCommand);
        newsForm.setCommandListener(this);

        news = new Alert("Hello World", "Because I'm cute!", null, AlertType.INFO);
        news.setTimeout(Alert.FOREVER);
        news.addCommand(backCommand);
    }

    public void startApp() 
    {
        if (display == null) 
        {
            display = Display.getDisplay(this);
        }
        display.setCurrent(newsForm);
    }

    public void pauseApp() {}

    public void destroyApp(boolean unconditional) {}

    public void commandAction(Command c, Displayable d) 
    {
        if (c == exitCommand) 
        {
            destroyApp(true);
            notifyDestroyed(); // Exit
        } 
        if (c == whyCommand) 
        {
            display.setCurrent(news, d);
            
        }
    }
}

And the result from that code look like this

Screenshot 1

Screenshot 2

Screenshot 3