public class NightState implements State {

private static NightState instance = new NightState();

private NightState() {}

public static NightState getInstance() {

return NightState.instance;

}

public void doClock(Context context, int hour) {

if (9 <= hour && hour < 17) {

context.changeState(DayState.getInstance());

}

}

public void doUse(Context context) {

context.callSecurityCenter("Use in night (emergency)");

}

public void doAlarm(Context context) {

context.callSecurityCenter("Ringing alarm (nighttime)");

}

public void doPhone(Context context) {

context.recordLog("Phone (nighttime)");

}

public String toString() {

return "NIGHTTIME";

}

}