Proceedings of the 5th international conference on Aspect-oriented software development
Model-Driven Development: Its Essence and Opportunities
ISORC '06 Proceedings of the Ninth IEEE International Symposium on Object and Component-Oriented Real-Time Distributed Computing
On the Semantics of Associations and Association Ends in UML
IEEE Transactions on Software Engineering
Design of a class library for association relationships
LCSD '07 Proceedings of the 2007 Symposium on Library-Centric Software Design
Mappings, maps and tables: towards formal semantics for associations in UML2
MoDELS'06 Proceedings of the 9th international conference on Model Driven Engineering Languages and Systems
First-class relationships in an object-oriented language
ECOOP'05 Proceedings of the 19th European conference on Object-Oriented Programming
ECMFA'11 Proceedings of the 7th European conference on Modelling foundations and applications
Content over container: object-oriented programming with multiplicities
Proceedings of the 2013 ACM international symposium on New ideas, new paradigms, and reflections on programming & software
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Relationships are difficult to implement for two main reasons: Firstly, they provide a complex semantics for relating entities and secondly, relationships are not first class constructs in modern programming languages. The challenge of implementing relationships in code is to resolve the semantics of abstract model elements and turn them into references or pointers of the target language. Language extensions or libraries are often discussed as a means of facilitating the translation of relations into code. We present an approach that uses plain Java language concepts for the implementation of UML associations. We focus on symmetry of associations as well as on navigability, visibility and ownership of association ends and present a code pattern, that can easily be used for automatic code generation.