By Khawar Zaman Ahmed
Constructing complicated software program calls for greater than simply churning out traces of code. As a software program architect or developer desirous about an business undertaking, you want to comprehend and be ready to leverage serious software program sub-disciplines akin to structure, research and layout strategies, improvement procedure, visible modeling, and the underlying know-how to be successful.This e-book brings these types of varied components jointly from the J2EE improvement standpoint to supply a holistic process for the reader. in particular, this booklet attempts to reply to the subsequent key questions:· what's UML and the way is it suitable to J2EE development?· How do Java and UML relate to every other?· What are the main options in software program architecture?· How does a software program improvement approach healthy into the J2EE software program improvement equation?· How can research and layout assist you in arriving at a greater J2EE software design?· What are the major J2EE applied sciences, and the way do they healthy together?· how will you leverage the UML for J2EE development?Rather than reinvent the wheel, the procedure taken during this e-book is that of bringing jointly recognized works equivalent to Jim Conallen's internet modeling profile and the solar Java Specification Request-26 for UML/EJB Mapping Specification.To offer a pragmatic representation of the themes mentioned, this ebook publications the readers via a pattern J2EE program improvement venture utilizing the Rational Unified technique and the UML. A operating implementation is equipped. feedback for additional improvements also are indexed to aid the readers in carrying on with their exploration of the UML and J2EE applied sciences.
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Additional resources for Developing enterprise Java applications with J2EE and UML
1, which was accepted by the OMG in late 1997. UML continues to evolve under the direction of the OMG. For example, recently proposed extensions provide common notations for data modeling, Web application modeling, and mapping J2EE constructs to UML. The UML has broad industry support. By virtue of being the specification supported by the 850+ member OMG, it is the de jure software industry standard for visual modeling and development. The fact that all leading tools for modeling software-intensive systems now support UML makes it the de facto standard as well.
Each end of the association is a role in UML terminology and may be named. For example, consider that a person may have a bidirectional association with a company that is employing the person. In this case, the roles may be named employer and employee, respectively. From an implementation perspective in Java, the roles may be appropriate as the names of the instance variables in the respective classes. It is usually helpful to name a role if it adds value to understanding the model. If not, it is perfectly reasonable to leave it unnamed.
In the UML, an association is shown by drawing a line between the classes that participate in the relationship. Associations may be unidirectional or bidirectional. Bidirectional association is shown with a simple line. Unidirectional association is shown with an arrow on one end. , the class that has the nonarrowhead side of the association) may invoke methods on the class towards which the arrow is pointing. In Java, this manifests itself as an instance variable on the class that may invoke methods.