public class SteamEngineObserver implements Observer {
	private SteamEngine watchedSteamEngine;

	public SteamEngineObserver(SteamEngine engine) {
		watchedSteamEngine = engine;
		watchedSteamEngine.add(this);
	}
	
	@Override
	public void update() {
		int temp = watchedSteamEngine.getTemp();
		System.out.println("temp: " + temp);
	}
}