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-So how do we represent a class in a class
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-diagram? Class is represented as a rectangle with three parts. The
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-first part is the class name. Classes should be named using
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-the vocabulary of the domain, so we should pick names that
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-make sense. And the normal naming standard requires that the classes
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-are singular nouns starting with a capital letter. The second part
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-of the class are the attributes of the class, where the
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-set of attribute for the class, we find the state for
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-the class. And, we can list an attribute simply by
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-name, or we can provide the additional information. For example,
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-we might define the title of the attribute, and we
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-might also define the initial. Value for the attribute. Finally, the
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-third part of the class consist of the operations of
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-the class. And normally, the operations of the class are represented
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-by name, with a list of arguments. That the operation
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-will take as input, and with a result type. So the
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-type of the result produced by the operation. Something
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-18
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-else you can notice in this representation is the
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-fact that there is a minus before these attributes
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-and a plus before this operation. This indicates what is
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-called the visibility of these class members. So the
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-minus indicates that the attributes are private to the class.
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-So only instances of this class, roughly speaking, can
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-access these attributes. And notice that this is what allows
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-to enforce the information hiding principle, because clients of
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-the class cannot see what's inside this box, what are
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-these attributes. The plus conversely indicates that this is a
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-public operation. So something that is visible outside the class.
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-And, in fact, normally, this is what we use to
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-define the interface for my class. So we encapsulate the
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-state of the class and we make it accessible to
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-the extent that we want and that is needed through
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-a set of public operations. Last thing I want to
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-note is the use of these ellipses that we can
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-utilize if we want to indicate that there are more
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-attributes for example, or more operations. But we just don't
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-want to list them now. Okay now that we know what
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-a class is, and how it is represented, let's start
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-our analysis of our course management system. By identifying the
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-relevant classes in the system, we need to bring back the
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-description of our system. And what we want to
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-do, is that we want to go through the description
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-and underline the relevant nouns in the description. And here
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-I encourage you to stop the video and to do
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-the exercise of underlying such nouns yourself before listening to
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-my explanation into how I do it. For example in
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-this case I might want to underlined the registration manager which
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-is a noun and probably a relevant one. The scheduling
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-algorithm, also seems like a relevant concept, so
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-is the course. The course offerings, again, course offerings
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-over here. Definitely, the students seem to be a
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-relevant noun and so is probably the registration form
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-and the professors. Okay, so, at this point, I
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-identified seven possible classes for my system. So, what
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-I'm going to do is simply to create classes for
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-each one of these nouns. So my initial class
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-diagram looks exactly like this, with the seven classes where
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-for each class, I picked the name that is representative of
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-the domain. So, in this case, it's pretty straightforward. The
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-registration form is called registration form, the student is called student
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-and so on and so forth. But you can already
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-see how this analysis method is starting from a description of
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-the real world and it's just identifying objects or classes
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-in the real world and transforming them into entities in my
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-analysis document.