Abstract: According to the specialty of automatic transformation from model to code in MDA, this paper proposes a method to transform association in UML class diagrams to code based on MDA. It discusses the association in UML and its two implementation patterns. For every pattern, it defines a suit of rules, which are used in transformation from UML model(PIM) to Java model(PSM), respectively. It presents two transformation examples of implementation pattern by using rules. 　　　

Key words: MDA, UML, Association, Implementation pattern, Transformation

摘要： 根据MDA中模型自动转换到代码的特点，提出了一种UML类图中关联关系到代码的转换方法。讨论了UML中关联关系及其两种实现模式，对每种模式分别定义了一套从UML模型（平台独立模型）到Java模型（平台相关模型）的变换规则，给出了两种实现模式按规则转换的实例。

关键词: 模型驱动构架, UML, 关联, 实现模式, 变换