U7_E7

public class Canvas1 extends MIDlet implements CommandListener{

private Canvas canvas;
    private Command cmdKeluar;
    private Display display;

public Canvas1(){
        cmdKeluar = new Command("Keluar", Command.EXIT, 1);
        canvas = new Canvas() {
            protected void paint(Graphics g) {
                throw new UnsupportedOperationException("Not supported yet.");
            }
        };
        canvas.addCommand(cmdKeluar);
        canvas.setCommandListener(this);
    }

public void startApp() {
        display = Display.getDisplay(this);
        display.setCurrent(canvas);
    }

public void commandAction(Command c, Displayable d) {
        if(d==canvas){
            if(c==cmdKeluar){
                destroyApp(false);
                notifyDestroyed();
            }
        }
    }