实现多态——虚方法
步骤：
1、将父类的方法标记为虚方法 ，使用关键字 virtual，这个函数可以被子类重新写一个遍。
练习：用常规和多态的方法实现 真鸭子嘎嘎叫 木头鸭子呜呜叫 塑料鸭子唧唧叫
方法一：用常规方法输出鸭子叫声（为方便查看写在一个类文件中）
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class Program { static void Main(string[] args) { ReallyDuck s = new ReallyDuck(); s.bark(); PlacticDuck m = new PlacticDuck(); m.bark(); WoodDuck d = new WoodDuck(); d.bark(); Console.ReadKey(); } } public class ReallyDuck { public void bark() { Console.WriteLine("真鸭子嘎嘎叫"); } } public class PlacticDuck { public void bark() { Console.WriteLine("塑料鸭子唧唧叫"); } } public class WoodDuck { public void bark() { Console.WriteLine("木头鸭子呜呜叫"); } } |
多态之虚方法:
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class Program { static void Main(string[] args) { ReallyDuak s = new ReallyDuak(); PlasticDuck m = new PlasticDuck(); WoolDuck w = new WoolDuck(); ReallyDuak[] really = {s,m,w}; for (int i = 0; i < really.Length; i++) { really[i].bark();//方法名一样从而隐藏了父类方法 } Console.ReadKey(); } } public class ReallyDuak { public virtual void bark() {//父类方法用virtual描述 Console.WriteLine("真鸭子嘎嘎叫"); } } public class PlasticDuck:ReallyDuak { public override void bark() { Console.WriteLine("塑料鸭子唧唧叫"); } } public class WoolDuck:ReallyDuak { public override void bark() { Console.WriteLine("木头鸭子呜呜叫"); } } |
