运行时多态性具有方法重写,也称为动态绑定或后期绑定。它是通过抽象类和虚函数来实现的。抽象类包含抽象方法,这些方法由派生类实现。
让我们看一个实现运行时多态性并与重写一起使用的抽象类的示例 -
示例
'using System;
namespace PolymorphismApplication {
abstract class Shape {
public abstract int area();
}
class Rectangle: Shape {
private int length;
private int width;
public Rectangle( int a = 0, int b = 0) {
length = a;
width = b;
}
public override int area () {
Console.WriteLine("Rectangle class area :");
return (width * length);
}
}
class RectangleTester {
static void Main(string[] args) {
Rectangle r = new Rectangle(10, 7);
double a = r.area();
Console.WriteLine("Area: {0}",a);
Console.ReadKey();
}
}
}