public Clock(IAlarm alarm, IDisplay display)
{
_alarm = alarm;
_buttonManager = new ButtonManager();
_display = display;
_modeManager = new ModeManager();
_timeManager = new TimeManager();
_timer = new SixtySecondTimer();
_buttonManager.SetModeManager(_modeManager);
_buttonManager.SetTimeManager(_timeManager);
_timeManager.SetAlarm(_alarm);
_timeManager.SetDisplay(_display);
_timeManager.SetModeManager(_modeManager);
_timer.SetTimeManager(_timeManager);
}