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code, the maintainers will have a good example to learn from But there should be close contact with the original development team and the maintenance team for as long as it is possible Eventually, however, most software takes on a life of its own, and it is likely that a significant portion of the original development team won't be around a few years down the line It is this aspect of software reality that makes it all the more critical to use good development practices It is here that object orientation can provide great paybacks
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We've been introducing various UML features as we've needed them So far, we've used class and object diagrams, use case diagrams, and sequence diagrams These diagrams are not the only UML diagrams available, although they are all we will use in this book "More UML Diagrams" on page 113 gives brief descriptions of the other diagrams provided by the UML These other diagrams are used to various degrees depending on the size of the project, and the design methodology used More UML Diagrams In addition to the class and object diagrams, use case diagrams, and sequence diagrams already discussed, the UML also provides the diagrams briefly described in this section
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Collaboration Diagram The Collaboration Diagram and the Sequence Diagram we've already discussed are both used to show object interaction While the Sequence Diagram shows dynamic interactions, the Collaboration Diagram shows the static relationships and messages between objects The Collaboration Diagram consists of objects, classes the objects belong to, links and messages with sequence numbers between these objects Different developers tend to use one or the other of collaboration or sequence interaction diagrams
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State Diagram The State Diagram is used when an object has well-defined states and serves as a complement to the class description It shows all possible states that objects of the class can have, and which events cause the state to change or transition The transition can also have an action connected to it, which specifies what should be done on transitions
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Activity Diagram Activity Diagrams are used to show the flow of activities in a procedure They show actions and the results of activities Activity diagrams focus on the high level view of an entire process They can also be used to help understand what is happening in a use case Activity diagrams are useful for showing workflow and in describing behavior of system with parallel processing
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Deployment Diagram A Deployment Diagram is used to represent physical relationships among the software and hardware components in a system It can show how components and objects move around a networked system over
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Package The UML Package symbol is used to group various UML items together into a single package Various diagrams can be grouped such as classes, use cases, or collaborations Then the relationships between various packages can be shown
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All software can benefit from at least some design There are several object-oriented development methodologies All include some form of planning, building, and release phases The initial design of a software project should be a collaboration between the customer and the developer
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Object discovery and development of coherent object hierarchies are two of the major activities of OOA CRC Cards and Use Cases are useful tools for software analysis OOD is refining the results of the OOA OOD takes the target environment into consideration, and turns the classes developed by the OOA into a design that includes most of the details of how the classes will be implemented The overall magnitude of a project has great influence on the kind of methodology used, and the actual development practices that are used for the project Continual coding, testing, debugging, and integration can enhance the development process, and lead to more robust and bug-free code