Source Code : Commands, Items, and Event Processing

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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;
      }
    }
  }
}


           
       

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