C # Interface, abstract class, inheritance synthesis small exercise

1 namespace Test2 {3     class Program4     {5         Static voidMain (string[] args)6         {7             //job: Rubber Rubber duck, wood duck, real duck realduck. 8             //Three ducks can swim, and the rubber ducks and the real ducks will bark,9             //just a different cry, the rubber Duck "haw" called, The Real Duck "quack" called, wooden ducks will not bark.Ten  OneDuck DK =NewRealduck (); A DK. Swim (); -Ibark IB =NewRealduck (); - ib. Bark (); the Console.readkey (); -         } -     } -     //for abstract Classes +      Public Abstract classDuck -     { +          Public Abstract voidSwim (); A     } at     //Interface -      Public InterfaceIbark -     { -         voidBark (); -     } -  in      Public classRealduck:duck, Ibark -     { to          Public voidBark () +         { -Console.WriteLine ("Real Duck Quack"); the         } *  $          PublicOverridevoidSwim ()Panax Notoginseng         { -Console.WriteLine ("Real ducks can swim"); the         } +     } A  the      Public classMuduck:duck +     { -          PublicOverridevoidSwim () $         { $Console.WriteLine ("Wood ducks can swim"); -         } -     } the  -      Public classXpduck:duck, IbarkWuyi     { the          Public voidBark () -         { WuConsole.WriteLine ("Rubber Duck chirp"); -         } About  $          PublicOverridevoidSwim () -         { -Console.WriteLine ("Rubber ducks can swim"); -         } A     } +}

C # Interface, abstract class, inheritance synthesis small exercise