C#语言学习--基础部分(十九)继承

１.字类无参实例化时,必须要有父类提供的一个默认方法。在字类实例化的时候，系统会调用子类的构造方法

2. base能够显式调用父类当中的一些非私有的字段，属性和方法

Console Demo:

1.Mammal:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace InherienceDemo
{
    class Mammal
    {
        //public string name;
        private string name;
        public Mammal() { }　//(若子类执行默认构造函数时必须提供)
        public  Mammal(string name)
        {
            this.name = name;
        }
        public string GetName()
        {
            return name;

        }
        public void Breath()
        {
            Console.WriteLine(name+",正在呼吸");
        }
        public void SuckleYoung()
        {
            Console.WriteLine(name+",正在哺乳");
        }
    }
}

 

2.Horse:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace InherienceDemo
{
    class Horse:Mammal
    {
        public Horse(string name)
            : base(name)
        { 
        }
        public void Trot()
        {
           Console.WriteLine(GetName()+",正在奔跑");
        }
    }
}

3.Whale

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace InherienceDemo
{
    class Whale:Mammal
    {
        //public void Swim()
        //{
        //    Console.WriteLine(name+",正在游水");
        //}
        //base能够显式调用父类当中的一些非私有的字段，属性和方法，若是base里不加name则是调用Mammal里的默认构造方法
        public Whale(string name):base(name)  
        {
        }
        public void Swim()
        {
            Console.WriteLine(GetName()+",正在游水");
        }
    }
}

4.Program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace InherienceDemo
{
    class Program
    {
        static void Main(string[] args)
        {
          
            Horse horse = new Horse("马");
            horse.Breath();
            horse.SuckleYoung();
            horse.Trot();
            Whale whale = new Whale("鲸鱼");
            whale.Breath();
            whale.SuckleYoung();
            whale.Swim();
            //Mammal mammal = new Mammal();
            //mammal.name = "哺乳动物";
            //mammal.Breath();
            //mammal.SuckleYoung();

            //Horse horse = new Horse();
            //horse.name = "马";
            //horse.Breath();
            //horse.SuckleYoung();
            //horse.Trot();
           
            //Whale whale = new Whale();
            //whale.name = "鲸鱼";
            //whale.Breath();
            //whale.SuckleYoung();
            //whale.Swim();
        }
    }
}