Expert answer:Relations Links Versus Subclasses

Solved by verified expert:Assignment:Relations: Links Versus SubclassesThe basis of object-oriented design and programming is the
class. The power of this approach comes from class relations or
associations. These are ways in which classes can interact with one
another. The two most important relations are inheritance and links.Inheritance means that one class is a subset of another class.
For example, the program developed in the Benchmarks could have the
Employee class be a child-class of a Person class. A child-class inherits directly from the parent-class.
A subclass structure is one in which a class will inherit from every
class above it in the hierarchy. The Person class might store name,
birthdate, address, and other similar information. The Employee class
would inherit all of that information as well as any methods and would
also add information and methods of its own like pay rate. This would
facilitate creating another child-class of Person called Customer that
would also inherit everything from Person but would be distinct from
Employee. The Discussion prompt described the possibility of making
PaidEmployee and Intern subclasses of Employee. Inheritance is shown in a
class diagram with an open arrow pointing from the child-class to the parent-class.Links mean that one class can pull information or methods from
another class or that another relationship exists. As an example, a
Payroll class might need to call the calculate_pay method for the
PaidEmployee class. As another example, there might be a separate
Department class, and the Employee class would have a “works in”
relationship with the Department class. Links are shown as either a
single line or as a line with diamonds on one or both ends. The form and
labeling of links helps to tell about the relationship between the
classes. You will utilize these forms in later systems courses, but for
now, just placing a line in the diagram with a brief description
describing the link is fine.Our example results in the following class diagram. This
diagram was created in Visio, which is one of several tools useful for
creating UML diagrams. Note
that not all aspects of this class UML diagram are completed. In some
cases, not all class information is included. This shows examples of
inheritance and linking but does not show the full system which will
have far greater complexity.Using one of the information systems examples explored in
previous weeks or another example of your own choosing, describe an
inheritance relation between two classes and show this with a class and
subclass in a diagram.Using one of the information systems examples explored in
previous weeks or another example of your own choosing, describe a link
relation between two classes and show this with a class diagram link. It
is not necessary to utilize the same system as for inheritance.For these diagrams, you may keep them simple. You will not be graded on multiplicity, public/private
designations, or distinctions among associations, aggregations, and
composition. All you need to do for each is show two class diagrams and
describe the relationship. You will cover other aspects when you study
system analysis and system design.Place both diagrams and the accompanying descriptions in a single document file with a cover sheet.

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