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Automating Software Engineering with CASE
Figure 5-3:
UML Use
Case
diagrams
define how
users need
to interact
with a
program,
such as this
diagram
describing
an online
shopping
program.
Customer
Search
for items
Place Order
Obtain Help
Vendor
Customer Support
Figure 5-4:
UML Class
diagrams
divide a
large
program
into multiple
objects and
define the
properties
and
methods of
each object.
Student
Name
Address
Student ID
Grade Point Average
Enroll
Name
Address
Salary
Teacher
Name
Course ID
Fees
Days Offered
Course
Add Student
Drop Student
Assign Teacher
An object’s properties define the type of data it can hold whereas an object’s
methods define what type of actions the object can perform. In Figure 5-4, the
three classes are Students, Teachers, and Courses. Students have properties,
such as their names and student ID numbers; Teachers have properties,
such as their names and salaries; and Courses have properties, such as its
name and days offered.
The Student class also has an Enroll method to model a student’s actions
in choosing a course to take. The Course class has three methods — Add
Student, Drop Student, and Assign Teacher. By using UML Class