I thought of some more things:

- inputs are usually callback events, so the thing I usually did was accumulate all inputs in the callback events and then processed them in the processInputs() method. Accumulate was something simple like pressedKeys |= pressedKey

- updateScreen() is usually just a call to repaint() or something like that, which makes the Operating System call your applications paint() method. My paint method looks like

paint(Graphics g){

drawBackground(g);

drawCounters(g);

drawMonsters(g);

drawPlayer(g);

}

and so on... Flex does things in a slightly different way, so it really depends on the technology you choose.