抽象类 抽象方法

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

namespace ConsoleApplication17
{
    abstract class fruit//建立一个抽象类  abstriact
    {
        public abstract void GrowInarea();//抽象方法
    }
}




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

namespace ConsoleApplication17
{
    class apple : fruit//可以理解为水果中的苹果
    {
        public override void GrowInarea()
        {
            Console.WriteLine("南方北方都可以种我。");
        }
    }
    class pineapple : fruit//可以理解为水果中的菠萝
    {
        public override void GrowInarea()
        {
            Console.WriteLine("我喜欢温暖，只能在南方见到我");
        }
    }
}



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

namespace ConsoleApplication17
{
    class Program
    {
        static void Main(string[] args)
        {
           fruit f;
           f = new apple();//实例化 
           f.GrowInarea();
           f = new pineapple();
           f.GrowInarea();
           Console.ReadLine();
        }
    } 
}