设计模式之备忘录

设计模式之---备忘录

public class TestClien
 {
  public void Client()
  {
   GameRole L = new GameRole();
   L.InitialState();
   L.ShowState();

   Menmeto m= L.SaveState();

   L.Fight();

   L.ShowState();

   L.RecoveryState(m);

   L.ShowState();

  }
 }

 public class GameRole
 {
  private int vitality;
  private int defense;
  private int attack;
  internal void InitialState()
  {
   vitality = 100;
   defense = 100;
   attack = 100;
  }

  internal void Fight()
  {
   vitality = 0;
   defense = 0;
   attack = 0;
  }

  internal void ShowState()
  {
   Console.WriteLine(this.vitality + this.attack + this.defense);
  }

  internal Menmeto SaveState()
  {
   Menmeto m = new Menmeto();
   m.Attack = this.attack;
   m.Defense = this.defense;
   m.Vitality = this.vitality;
   return m;
  }

  internal void RecoveryState(Menmeto m)
  {
   this.vitality = m.Vitality;
   this.defense = m.Defense;
   this.attack = m.Attack;
  }
 }

 public class Menmeto
 {
  private int vitality;

  public int Vitality
  {
   get { return vitality; }
   set { vitality = value; }
  }
  private int defense;

  public int Defense
  {
   get { return defense; }
   set { defense = value; }
  }
  private int attack;

  public int Attack
  {
   get { return attack; }
   set { attack = value; }
  }
 }

写完备忘录模式的代码，发现把聚合menmeto的manager类完全省略了，这个模式也能实现。

它也能解决维护或者记录历史的问题，使得玩家能够还原到前一状态。