c7-11.cs

一本很好的教材.C#开发者必备.内容全面,很难得哦.

//多态性的示例
using System;
class Vehicle//定义汽车类
{
public int wheels; //公有成员轮子个数
protected float weight; //保护成员重量
public Vehicle(int w,float g){
wheels = w;
weight = g;
}
public virtual void Speak(){
Console.WriteLine("w正在鸣叫!");
}
}
class Car:Vehicle //定义轿车类
{
int passengers; //私有成员乘客数
public Car(int w,float g,int p) : base(w,g)
{
wheels = w;
weight = g;
passengers = p;
}
public override void Speak(){
Console.WriteLine("汽车正在鸣叫:嘀嘀!");
}
}
class Truck:Vehicle //定义卡车类
{
int passengers; //私有成员乘客数
float load; //私有成员载重量
public Truck (int w,float g,int p,float l) : base(w,g)
{
wheels = w;
weight = g;
passengers = p;
load = l;
}
public override void Speak(){
Console.WriteLine("卡车正在鸣叫:叭叭!");
}
}
class Test
{
public static void Main(){
Vehicle v1 = new Vehicle(3,2);
Car c1 = new Car(4,2,5);
Truck t1 = new Truck(6,5,3,10);
v1.Speak();
v1 = c1;
v1.Speak();
c1.Speak();
v1 = t1;
v1.Speak();
t1.Speak();
}
}