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

/**
 * Class Hello - A simple Hello World MIDlet
 *
 * @author     Ian Utting
 * @version    1.0
 */
public class Hello extends MIDlet implements CommandListener
{
    private Form screen;
   /**
    * Called by the Application Management Software (AMS) when the MIDlet
    * begins execution.  The AMS is the software on a device that manages 
    * the downloading and life-cycle of MIDlets.  When this constructor 
    * returns, the AMS places the MIDlet in the Paused state.
    */
    public Hello()
    {
        screen = new Form("Hello Midlet");
        screen.append("Hello small world!");
        screen.addCommand(new Command("Exit", Command.EXIT, 0));
        screen.setCommandListener(this);
    }

   /**
    * Called by the AMS to shift the MIDlet to the Active state from
    * the Paused state. While the MIDlet is Active, the AMS can suspend 
    * its execution by calling pauseApp().
    */
    public void startApp()
    {
        Display.getDisplay(this).setCurrent(screen);
    }

   /**
    * Called by the AMS to shift the MIDlet to the Paused state from
    * the Active state. While the MIDlet is Paused, the AMS can resume 
    * its execution by calling startApp().
    * The AMS may shift the MIDlet from Paused to Active or back any
    * number of times during its execution.
    */
    public void pauseApp()
    {
        // Release shared resources allocated in startApp().
    }

   /**
    * Called by the AMS to terminate execution of the MIDlet.
    * When this method returns, the MIDlet enters the Destroyed 
    * state.
    *
    * @param unconditional   Whether to destroy the MIDlet. If true the
    *                        MIDlet will enter the Destroyed state regardless
    *                        of how this method terminates. If false the MIDlet
    *                        may throw a MIDletStateChangeException to request
    *                        that it not be destroyed at this time.
    */
    public void destroyApp(boolean unconditional)
    {
        // Release resources acquired in the constructor.
    }
    
    /**
     * Called when a Command is invoked by the user.
     * In this case, just exit the MIDlet, if it was our Exit command which
     * was the cause.
     * @param   c   The Command which caused this action.
     * @param   d   The screen which was being displayed at the time.
     */ 
    public void commandAction(Command c, Displayable d) {
        // If it's our exitCommand, destroy ourselves
        if(c.getLabel().equals("Exit")) {
            notifyDestroyed();
        }
    }
}