refer to the following interface, interface circusshow abstract elass and classes public entrance public void o, public announcement public void exit Abstract class performer implementa circusshow public void entrance o System out printin ("Performer enters arena in parade.")i public void a entrance announcement performance exit public void announcement System out.println Ringmaster announces performer entering arena." public void exit system. out.println Performer receives flowers and leaves arena class Juggler extends Performer public void performance System.out.println Performer juggles 4 knives. class Equestrian extends Performer public void performance System.out.println ("Performer rides standing on two ponies.") class LionTamer extends Performer public void performance in a cage. System.out.println ("Performer manages five lions Chapter 12 Interfaces and Abstract classes 173