設計模式—狀態模式（今天CSDN竟然上不去，暫時發在這裡） (從百度空間轉回來的)

設計模式---狀態模式（今天CSDN竟然上不去，暫時發在這裡）

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

namespace ConsoleApplication1
{
    abstract class State
    {
        public abstract void DoWhatIShouldDo(Worker w);
    }

    class Young : State
    {
        public override void DoWhatIShouldDo(Worker w)
        {
            if(w.Age <=35)
            {
                Console.WriteLine("我年輕，逍遙自在");
            }
            else
            {
                w.State = new MiddleAge();
                w.DoWhatIShouldDo();
            }
        }
    }

    class MiddleAge : State
    {
        public override void DoWhatIShouldDo(Worker w)
        {
            if (w.Age<=50 )
            {
                Console.WriteLine("人到中年");
            }
            else
            {
                w.State = new Old();
                w.DoWhatIShouldDo();
            }
        }
    }

    class Old : State
    {
        public override void DoWhatIShouldDo(Worker w)
        {
            Console.WriteLine("老年生活");
        }
    }

    class Worker
    {
        State state;
        int age;

        public Worker()
        {
            age = 1;
            state = new Young();
        }
   
        public int Age
        {
            get
            {
                return age;
            }
            set
            {
                age = value;
            }
        }

        public State State
        {
            get
            {
                return State;
            }
            set
            {
                state = value;
            }
        }

        public void DoWhatIShouldDo()
        {
            state.DoWhatIShouldDo(this);
        }
    }

    class Client
    {
        public static void Main()
        {
            Worker w = new Worker();
            w.Age = 5;
            w.DoWhatIShouldDo();
            w.Age = 45;
            w.DoWhatIShouldDo();
            w.Age = 80;
            w.DoWhatIShouldDo();
            Console.Read();
        }
    }
}