Commands, Items, and Event Processing

//jad file (please verify the jar size)
/*
MIDlet-Name: ThrowException
MIDlet-Version: 1.0
MIDlet-Vendor: MyCompany
MIDlet-Jar-URL: ThrowException.jar
MIDlet-1: ThrowException, ThrowException.png, ThrowException
MicroEdition-Configuration: CLDC-1.0
MicroEdition-Profile: MIDP-1.0
MIDlet-JAR-SIZE: 100

*/

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class ThrowException extends MIDlet implements CommandListener {
  private Display display;

  private Form form = new Form("Throw Exception");

  private Command exit = new Command("Exit", Command.SCREEN, 1);

  private boolean isSafeToQuit = false;

  public ThrowException() {
    display = Display.getDisplay(this);
    form.addCommand(exit);
    form.setCommandListener(this);
  }

  public void startApp() {
    display.setCurrent(form);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) throws MIDletStateChangeException {
    if (unconditional == false) {
      throw new MIDletStateChangeException();
    }
  }

  public void commandAction(Command command, Displayable displayable) {
    if (command == exit) {
      try {
        if (isSafeToQuit == false) {
          StringItem msg = new StringItem("Busy", "Please try again.");
          form.append(msg);
          destroyApp(false);
        } else {
          destroyApp(true);
          notifyDestroyed();
        }
      } catch (Exception exception) {
        isSafeToQuit = true;
      }
    }
  }
}

1.	Simple Command Demo
2.	Commander
3.	Various Event
4.	Api concepts Refer to the startApp pauseApp, and destroyApp
5.	An example MIDlet with simple Hello text and an Exit command
6.	Online Help
7.	A first MIDlet with simple text and a few commands.
8.	Many Commands
9.	Mapping Commands
10.	Capture Item Events
11.	Accessing Commands
12.	A quick sample of graphics, commands, and event handling.

Commands, Items, and Event Processing : Event Command « J2ME « Java

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