C#面向对象设计模式纵横谈——7. Adapter适配器模式

主讲：李建忠

来源：http://www.microsoft.com/china/msdn/events/webcasts/shared/webcast/consyscourse/CsharpOOD.aspx

 

 

Adapterinterface IStack	//客户期望的接口

{

    void Push(object item);

    object Pop();

    object Peek();

}



//对象适配器

class MyStack:IStack    //adapter，适配对象

{

    ArrayList list;    //adaptee，被适配对象



    public MyStack()

    {

	list=new ArrayList();

    }   



    public void Push(object item)

    {

        list.Add(item);

    }



    object Pop()

    {

        return list.RemoveAt(list.Count-1);

    }



    object Peek()

    {

        return list[list.Count-1];

    }

}



//类适配器

class MyStack:ArrayList,IStack    //adapter，适配对象

{

    public void Push(object item)

    {

        this.Add(item);

    }



    object Pop()

    { 

        return this.RemoveAt(this.Count-1);

    }



    object Peek()

    {

        return this[this.Count-1];

    }

}

EmployeeAdapterclass Employee

{

  int age;

  string name;  



  public int Age

  {

    get{return this.age;}

    set{this.age=value;}

  }

}



class EmployeeAdapter:IComparable

{

  public int Compare(object obj1,object obj2)

  {

    if(obj1.GetType()!=typeof(Employee)

       ||obj2.GetType()!=typeof(Employee))

    {

      throw new Exception();

    }



    Employee e1=(Employee)obj1;

    Employee e2=(Employee)obj2;



    if(e1.Age==e2.Age)

    {

      return 0;

    }

    else if(e1.Age>e2.Age)

    {

      return 1;

    }

    else if(e1.Age<e2.Age)

    {

      return -1;

    }

  }

}



class App

{

  public static void Main()

  {

    Employee[] employees=new Employee[100];

    //...



    ArrayList.Sort(employees,new EmployeeAdapter())

  }

}