using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 對象交互{    class PRogram    {        static void Main(string[] args)        {            RemoteControl c = new RemoteControl();            Television tv = new Television();            c.TurnOn(tv);            c.ChangeChannel(tv);            c.TurnOff(tv);            Console.ReadLine();        }    }}
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 對象交互{    class RemoteControl    {        public void TurnOn(Television tv) {            tv.Open();        }        public void TurnOff(Television tv)        {            tv.TurnOff();        }        public void ChangeChannel(Television tv)        {            Console.Write("請輸入頻道號");            string channelNo = Console.ReadLine();            tv.Change(channelNo);        }    }}
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 對象交互{    class Television    {        private Boolean isNo = false;        public void Open() {            if (isNo)            {                Console.WriteLine("電視機已打開");            }            else {                Console.WriteLine("成功打開電視機");                isNo = true;            }                }        public void TurnOff()        {            if (isNo)            {                Console.WriteLine("正在關機。。。");                isNo = false;            }            else            {                Console.WriteLine("電視機已關閉");                           }        }        public void Change(string channelNo)        {            if (isNo)            {                Console.WriteLine("正在切換到{0}臺",channelNo);                            }                    }    }}