Definition
解耦抽象（是实现的更高层次的抽象）和它的实现，使他们可以独立变化
UML class diagram
Partticipants
Abstraction （MusicPlayer）
定义一个抽象的Interface
维护一个一个实现对象的引用
RefinedAbstraction （WebMusicPlayer, WinformMusicPlayer）
实现Abstraction的接口
Implementor (IDecode)
定义实现的类的Interface
这个接口不必与抽象的Interface相同，而实际上这俩个接口可以完全不同，常常是 实现接口紧紧提供一个现实对象的操作，
而抽象接口定义是基于一批现实对象的一个高层次的操作，其实我们可以找个看成俩个维度，其中一个维度是另外一个维度的
更高层次的抽象
ConcreteImplement (
Mp3Decode, APEDecode)
实现了Implementor 的Interface 并实现了具体的操作
Sample Codes in C# 1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Threading.Tasks;
6
7 namespace Sman.DesignPattern.SampleCodes.Structual
8 {
9 public interface IDecode
10 {
11 void Decode();
12 }
13 public class Mp3Decode : IDecode
14 {
15 public void Decode()
16 {
17 Console.WriteLine("Mp3 .... reading");
18 }
19 }
20 public class APEDecode : IDecode
21 {
22 public void Decode()
23 {
24 Console.WriteLine("APE .... reading");
25 }
26 }
27 public abstract class MusicPlayer
28 {
29 public IDecode Implementor
30 {
31 set;
32 get;
33 }
34 public abstract void Play();
35 }
36
37 public class WebMusicPlayer:MusicPlayer
38 {
39
40 public override void Play()
41 {
42 Console.WriteLine("This is a web Music Player");
43 Implementor.Decode();
44 }
45 }
46 public class WinformMusicPlayer : MusicPlayer
47 {
48 public override void Play()
49 {
50 Console.WriteLine("This is a Winform Music Player");
51 Implementor.Decode();
52 }
53 }
54 }
55
56 -- Client Codes
57
58 MusicPlayer player = new WinformMusicPlayer();
59 IDecode decode = new Mp3Decode();
60 player.Implementor = decode;
61 player.Play();
62
63 player = new WebMusicPlayer();
64 decode = new APEDecode();
65 player.Implementor = decode;
66 player.Play();
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Threading.Tasks;
6
7 namespace Sman.DesignPattern.SampleCodes.Structual
8 {
9 public interface IDecode
10 {
11 void Decode();
12 }
13 public class Mp3Decode : IDecode
14 {
15 public void Decode()
16 {
17 Console.WriteLine("Mp3 .... reading");
18 }
19 }
20 public class APEDecode : IDecode
21 {
22 public void Decode()
23 {
24 Console.WriteLine("APE .... reading");
25 }
26 }
27 public abstract class MusicPlayer
28 {
29 public IDecode Implementor
30 {
31 set;
32 get;
33 }
34 public abstract void Play();
35 }
36
37 public class WebMusicPlayer:MusicPlayer
38 {
39
40 public override void Play()
41 {
42 Console.WriteLine("This is a web Music Player");
43 Implementor.Decode();
44 }
45 }
46 public class WinformMusicPlayer : MusicPlayer
47 {
48 public override void Play()
49 {
50 Console.WriteLine("This is a Winform Music Player");
51 Implementor.Decode();
52 }
53 }
54 }
55
56 -- Client Codes
57
58 MusicPlayer player = new WinformMusicPlayer();
59 IDecode decode = new Mp3Decode();
60 player.Implementor = decode;
61 player.Play();
62
63 player = new WebMusicPlayer();
64 decode = new APEDecode();
65 player.Implementor = decode;
66 player.Play();