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Chapter 3. Class and Object Diagrams
This chapter focuses on class and object diagrams, which depict the
structure of a system in general and at a particular point in time,
respectively. First, I introduce class and object diagrams and how
they are used. Next, I discuss classes, objects, and their details
for modeling the elements that make up a system. Then, I go over
associations, links, and their details for modeling the relationships
among the elements that make up a system. Finally, I discuss various
other types of elements and relationships. Many details that were not
fleshed out in Chapter 2 are more fully elaborated
here, and throughout the chapter I include suggestions relating to
class and object diagrams.Class modeling is a specialized type of modeling concerned with the general
structure of a system. Object modeling is a specialized type of
modeling concerned with the structure of a system at a particular
point in time. You usually apply class and object modeling during
analysis and design activities to understand the requirements and
determine how a system will satisfy its requirements. Object modeling
is usually used in conjunction with class modeling to explore and
refine class diagrams. Class and object modeling usually start after
the requirements have matured enough (as determined by your system
development process) and continue in parallel with interaction and
collaboration modeling (Chapter 6) throughout the
system development process, while focusing on the elements that make
up the system and their relationships.As an architecture-centric process focuses on the architecture of a
system across iterations, it is important to understand what elements
make up a system and how they are related to one another. Given that
every project has limited resources, you can use this information to
determine how best to develop a system. This allows architects,
designers, and developers to consider technical trade-offs concerning
the system, including which elements can be developed in parallel,
which elements can be purchased rather than built, and which elements
can be reused.
