Dynamic polymorphism by abstract classes and virtual functions. - CSharp Custom Type

CSharp examples for Custom Type:Polymorphism

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Description

Dynamic polymorphism by abstract classes and virtual functions.

Demo Code

using System;//from   www.j  ava 2s .  c  om
class Shape {
   protected int width, height;
   public Shape( int a = 0, int b = 0) {
      width = a;
      height = b;
   }
   public virtual int area() {
      Console.WriteLine("Parent class area :");
      return 0;
   }
}
class Rectangle: Shape {
   public Rectangle( int a = 0, int b = 0): base(a, b) {
   }
   public override int area () {
      Console.WriteLine("Rectangle class area :");
      return (width * height);
   }
}
class Triangle: Shape {
    public Triangle(int a = 0, int b = 0): base(a, b) {
    }
    public override int area() {
        Console.WriteLine("Triangle class area :");
        return (width * height / 2);
    }
}
class Caller {
    public void CallArea(Shape sh) {
        int a;
        a = sh.area();
        Console.WriteLine("Area: {0}", a);
    }
}
class Tester {
    static void Main(string[] args) {
        Caller c = new Caller();
        Rectangle r = new Rectangle(10, 7);
        Triangle t = new Triangle(10, 5);
        c.CallArea(r);
        c.CallArea(t);
    }
}

Result


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