主讲：李建忠

来源：

 

 

1:  abstract class StatedDocument    //抽象类——表达状态及依赖状态的行为

2:  {

3:      public abstract void Handle1();

4:      public abstract void Handle2();

5:      public abstract void Handle3();

6:   

7:      public abstract StatedDocument Next

8:      {

9:          get;

10:          set;

11:      }

12:  }

13:   

14:  class Document   //主逻辑

15:  {

16:      StatedDocument statedDocument;

17:   

18:      public void SetStatedDocument(StatedDocument statedDocument)

19:      {

20:          this.statedDocument=statedDocument;

21:      }

22:   

23:      public void Handle1()

24:      {

25:          statedDocument.Handle1();

26:          statedDocument=statedDocument.Next;

27:      }

28:   

29:      public void Handle2()

30:      {

31:          statedDocument.Handle2();

32:      }

33:   

34:      public void Handle3()

35:      {

36:          statedDocument.Handle3();

37:      }

38:  }