public static void Main()
{
// by only changing this instance of AbstractUnitFactory to another - all the code will continue to work
AbstractUnitFactory unitFactory = new ZergUnitFactory();
// AbstractUnitFactory unitFactory = new TerranUnitFactory();
GathererUnit gatherer = unitFactory.GetGatherer();
FighterUnit fighter = unitFactory.GetFighter();
FlyingUnit flyer = unitFactory.GetFlyer();
gatherer.Gather();
fighter.Engage();
flyer.Fly();
}
