[設計模式練習]備忘錄模式

2010-04-12

將男生女生分成認識和不認識利用備忘錄模式設計(有點差=.=)

初始狀態為不認識

在認識後可以回復初始狀態(這倒是真的翻臉比翻書還快=.=)

類別圖

物件檔定義


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

namespace DesignModelTest.備忘錄
{
    /// <summary>
    /// 發起人:關係
    /// </summary>
    class Relation
    {
        private string man;//男生姓名
        private string woman;//女生姓名
        private string relation;//關係
        public Relation(string manName, string womanName)
        {
            this.man = manName;
            this.woman = womanName;
        }
        /// <summary>
        /// 初始狀態不認識.
        /// </summary>
        public void initial()
        {
            this.relation = "不認識";
        }
        /// <summary>
        /// 認識.
        /// </summary>
        public void knowing()
        {
            this.relation = "認識";
        }
        /// <summary>
        /// 顯示目前關係.
        /// </summary>
        public void DisplayRelation()
        {
            Console.WriteLine(this.man + "\t" + this.relation + "\t" + this.woman);
        }
        /// <summary>
        /// 儲存狀態.
        /// </summary>
        /// <returns></returns>
        public Memento SaveState()
        {
            return (new Memento(this.relation));
        }
        /// <summary>
        /// 回復狀態.
        /// </summary>
        /// <param name="memento">The memento.</param>
        public void RecoveryState(Memento memento)
        {
            this.relation = memento.state;
        }
    }
    /// <summary>
    /// 備忘錄:負責儲存發起人的內部狀態
    /// </summary>
    class Memento
    {
        private string _state;
        public Memento(string state)
        {
            this._state = state;
        }
        public string state
        {
            get { return _state; }
        }
    }
    /// <summary>
    /// 管理者:負責保存好備忘錄
    /// </summary>
    class Caretaker
    {
        public Memento _memento;        

    }
}

用戶端程式碼


            DesignModelTest.備忘錄.Relation r1 = new DesignModelTest.備忘錄.Relation("男生", "女生");
            r1.initial();//初始狀態為不認識
            r1.DisplayRelation();
            DesignModelTest.備忘錄.Caretaker c1 = new DesignModelTest.備忘錄.Caretaker();
            c1._memento = r1.SaveState();//存入資訊(初始狀態為不認識)
            r1.knowing();//將狀態改為認識
            r1.DisplayRelation();
            r1.RecoveryState(c1._memento);//回復資訊為不認識
            r1.DisplayRelation();
            Console.Read();
            #endregion

輸出結果

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