UML Overview in Java

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UML Overview
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The central idea behind using the UML is to capture the significant details about a system such that the problem is clearly understood, solution architecture is developed, and a chosen implementation is clearly identified and constructed
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A rich notation for visually modeling software systems facilitates this exercise The UML not only provides the notation for the basic building blocks, but it also provides for ways to express complex relationships among the basic building blocks
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Relationships can be static or dynamic in nature Static relationships primarily revolve around the structural aspects of a system Inheritance relationship between a pair of classes, interfaces implemented by a class, and dependency on another class are all examples of static relationships
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Dynamic relationships, on the other hand, are concerned with the behavior of a system and hence exist at execution time The messages exchanged within a group of classes to fulfill some responsibility and flow of control within a system, for example, are each captured in the context of the dynamic relationships that exist within a system
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Both static and dynamic aspects of a system are captured in the form of UML diagrams There are several types of UML diagrams They are organized along specific focal areas of visual modeling called views
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The following types of diagrams are provided by the UML:
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Use case diagram: A use case diagram shows use cases, actors, and their relationships Use case diagrams capture the precise requirements for the system from a user's p erspective See 7 for a detailed discussion of use cases in the context of enterprise Java application development
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Class diagram: A class diagram shows the static relationships that exist among a group of classes and interfaces in the system Some common relationship types are
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inheritance, aggregation, and dependency See 8 for more details on classes, interfaces, and class diagrams
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Object diagram: An object diagram provides a snapshot view of the relationships that exist between class instances at a given point in time An object diagram is useful for capturing and illustrating, in a static fashion, complex and dynamic relationships within the system See s
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for additional coverage of how object
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diagrams are used in the context of enterprise application design and development
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Statechart diagram: State machines are excellent for capturing the dynamic behavior of the system They are particularly applicable to event driven, reactive systems or objects where event order is important State charts are also useful for modeling the behavior of interfaces For more information on using statecharts in the context of J2EE, see
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Activity diagram: An activity diagram is an extension of a statechart diagram and is similar in concept to a flowchart An activity diagram allows you to model the system's behavior in terms of interaction or flow of control among distinct activities or objects Activity diagrams are best used for modeling workflows and flow within operations See
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for further discussion of activity diagrams
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Interaction diagram: Interaction diagrams are used for modeling the dynamic behavior of a system There are two kinds of interaction diagrams in the UML:
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Sequence diagram: Used for modeling the message exchange between objects in a system Sequence diagrams also capture the relative time ordering of messages exchanged
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Collaboration diagram: The message exchange is captured in the context of the overall structural relationships among objects
The two diagrams are equivalent, and it is possible to convert from one to the other easily Interaction diagrams are commonly used to model the flow of control in a use case and to describe how objects interact during the execution of an operation, such as the realization of an interface operation Interaction diagrams are discussed in
8
Component diagram: A component represents the physical manifestation of a part of the system, such as a file, an executable, and so o n A component diagram illustrates the dependencies and relationships among components that make up a system A
component typically maps to one or more classes, subsystems, and so on Components and component diagrams are discussed in
Deployment diagram: A deployment diagram shows the architecture of a system from the perspective of nodes, processors, and relationships among them One or more components typically map to a deployment node In the context of J2EE, deployment diagrams are useful for modeling and developing the distributed system architecture Deployment diagrams are discussed in
The UML is a comprehensive subject worthy of a book itself (and in fact, several good ones have already been written!) Only the most relevant aspects are covered in this book Refer to the References section at the end of this book for a list of some excellent books on the UML that provide a more in -depth discussion of specific areas of the UML