unity第二周：虚拟方法的理解

一：

using System;
using System.Collections.Generic;

namespace 虚拟方法的理解0
{
public class shape
{
public int Normal(){return 0; }
public int x{get;private set; }//属性
public int y { get; private set; }
public int Height { get; set; }
public int width { get; set; }
public virtual void RenderShape()
{
Console.WriteLine("渲染");
// return;
}

}
public class Rect:shape//这里对比抽象方法和虚拟方法，抽象不实现会报错，虚拟则不会
{
public override void RenderShape()
{
Console.WriteLine("画一个矩形");
// base.RenderShape();
}
}
public class Circle:shape
{
public override void RenderShape()
{
Console.WriteLine("画一个圆");
// base.RenderShape();
}
}
class Program
{
static void Main(string[] args)
{
//可变类型
var shapes = new List<shape>
{
new Rect(),
new Circle(),
};
foreach (shape item in shapes)//或者var item
{
item.RenderShape();
}
//Console.WriteLine("Hello World!");
}
}
}

二：

using System;

namespace 第二周_虚拟方法的理解
{
public class shape
{
protected int width, length;
public shape(int a = 0, int b = 0)
{
width = a;
length = b;
}
// public virtual int GetArea();//一定要实现
public virtual int GetArea()
{
Console.WriteLine("父类面积的计算：");
return 0;
}
}
public class Rect : shape
{
public Rect(int a = 0, int b = 0) : base(a, b)//后面的a,b其实是Rec里面的a,b
{
//传值过程，从Rect传a,b然后传到base类，调用
//基类shape的构造函数,base指shape
}
public override int GetArea()
{
Console.WriteLine("矩形的面积");
return (width * length);
}
}
public class Triangle:shape
{
public Triangle(int a=0,int b=0):base(a,b)
{

}
public override int GetArea()
{
Console.WriteLine("三角形的面积：");
return width*length/2 ;
}
}
public class AreaCalculator
{
public void CalculateArea(shape sh)//这里虽然写的是shape，但其实以shape为父类的类都可以写入，用大范围包含小范围理解
{
int a;
a = sh.GetArea();
Console.WriteLine("面积：" + a);
}
}
class Program
{
static void Main(string[] args)
{
// Console.WriteLine("Hello World!");
AreaCalculator areaCaculateArea = new AreaCalculator();
Rect rect = new Rect(1,2);
Triangle tr = new Triangle(3,4);
areaCaculateArea.CalculateArea(rect);
areaCaculateArea.CalculateArea(tr);
}
}
}

unity第二周：虚拟方法的理解

原文：https://www.cnblogs.com/Nicela/p/13130054.html