UML中的关联关系其内在意思就是has a 如图: 
相对于依赖关系,关联关系在代码中有所体现.上图中的关联关系在代码中体现为
其中water 中将Climate作为其中的属性.
当然,关联关系中也有双相关联,如图:
关联又分为组合,聚合
对应的代码如下: 
设计模式中的关联关系 
代码如下:
1: //工作经历
2: class WorkExperience
3: {
4: private string workDate;
5: public string WorkDate
6: {
7: get { return workDate; }
8: set { workDate = value; }
9:
10: }
11:
12: private string company;
13: public string Company
14: {
15: get { return workDate; }
16: set { workDate = value; }
17: }
18: }
19:
20: //简历
21: class Resume : ICloneable
22: {
23: private string name;
24: private string sex;
25: private string age;
26:
27: private WorkExperience work;//组合关系,简历必须有工作经历
28:
29: public Resume(string name)
30: {
31: this.name = name;
32: work = new WorkExperience();
33: }
34:
35: //设置个人信息
36: public void SetPersonInfo(string sex, string age)
37: {
38: this.age = age;
39: this.sex = sex;
40: }
41:
42: //设置个人经历
43: public void SetWorkExperience(string workDate, string company)
44: {
45: work.WorkDate = workDate;
46: work.Company = company;
47: }
48: //显示
49: public void Display()
50: {
51: Console.WriteLine("个人信息");
52:
53: }
54: public object clone()
55: {
56: return (Object)this.MemberwiseClone();
57:
58: }
59: }
转自：http://blog.csdn.net/lsh6688/article/details/6027922