public class CriticalTemperatureObserver implements SimpleObserverI {
    SteamEngineC myEngine;
    int criticalTemperature;

    public CriticalTemperatureObserver(SteamEngineC engine, int critical) {
        myEngine = engine;
        criticalTemperature = critical;
        myEngine.add(this);
    }

    @Override
    public void update() {
        if (myEngine.getTemp() > criticalTemperature) {
            System.out.println("Critcal temperature reached, shutting down...");
            System.exit(0);
        }
    }
}