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

public class HelloClass extends MIDlet implements CommandListener {

Display d = Display.getDisplay(this);
private Command exit = new Command("exit",Command.EXIT,0);

 public void startApp() {
HelloCanvas Canv = new HelloCanvas();
Canv.addCommand(exit);
Canv.setCommandListener(this);
d.setCurrent(Canv);
 }

 public void pauseApp() {
 }

 public void destroyApp(boolean u) {
notifiDestroyed();
 }

 public void commandAction(Command command,Displayable displayable) {
if(command == exit){
destroyApp(false);
 }
}