the OO model is good in general, do not listen to these who says it should be one utility method or class.

but I would expose only one class/interface- converter, no need to expose all classes (minutes,hours)

I would add Lamp model and BerlinClock or BerlinClockConverter model

I would not use static runner

I would rename getTime() - String time = BerlinClock.get("again string") - doesn't look clear.

BerlinClock berlinClock = BerlinClock.createInstance("timesastring"); System.out.println (berlinClock.toString());

the OO model is good in general, do not listen to these who says it should be one utility method or class.

but I would expose only one class/interface- converter, no need to expose all classes (minutes,hours)

I would add Lamp model and BerlinClock or BerlinClockConverter model

I would not use static runner

I would rename getTime() - String time = BerlinClock.get("again string") - doesn't look clear.

BerlinClock berlinClock = BerlinClock.createInstance("timesastring"); System.out.println (berlinClock.toString());