Chapter 12
True/False
Indicate whether the statement is true or false.
____
1. Design class diagrams and sequence diagrams should be developed independent of each other.
____
2. Design classes always have foreign keys.
____
3. Dependency relationships cannot exist between classes within packages.
____
4. The activation lifeline is depicted by a vertical dashed line under an object.
____
5. The perfect memory assumption means that there is always adequate memory to execute the program.
____
6. The perfect solution assumption means that we do not worry about exception conditions.
____
7. The first-cut DCD includes method signatures.
____
8. A loop or repeating message in a sequence diagram is depicted by a rectangle box.
____
9. Separation of responsibilities is a design principle to segregate classes into separate components based on the
primary focus of the classes.
____ 10. Since updating a design class diagram is done after the use case realization is complete, visibility information
is no longer necessary.
____ 11. Usually editing and validating the input data is done as part of the business logic layer.
____ 12. Preparing persistent classes for storage to the database is done by the data access layer.
____ 13. The factory method pattern is used to create classes that can be used to instantiate objects from utility classes.
____ 14. The Observer pattern is also called the listener pattern.
____ 15. In the observer pattern, the object being observed must have a method to register listeners.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 16. Which of the following is an example of an interaction diagram?
a. Design class diagram
c. Package diagram
b. Data access diagram
d. Communication diagram
____ 17. The primary OO design models are ____ diagrams.
a. design class and statechart
c. package and deployment
b. package and statechart
d. design class and interaction
____ 18. The realization of a use case—determining what objects collaborate and the messages they send to each other
to carry out the use case—is done through the development of a(n) ____.
a. deployment diagram
c. statechart diagram
b. interaction diagram
d. package diagram
____ 19. The domain layer of a multilayer design can also be referred to as the ____ layer.
a. business logic
c. user interface
b. database access
d. program logic
____ 20. The database access object corresponds to the ____ layer in the multilayer design.
a. first
c. third
b. second
d. None of the above
____ 21. What is the least cohesive approach in creating use case controllers in a system?
a. Define a single use case controller for all use cases.
b. Define several use case controllers, each with a specific set of responsibilities.
c. Create a single use case controller for all the use case controllers in a single subsystem.
d. Create one use case controllers per use case.
____ 22. The output message in a sequence diagram usually contains ____.
a. a lifeline reference
c. loop frames
b. return variables
d. a data object reference
____ 23. What is the first step in constructing a first-cut sequence diagram from the elements of the system sequence
diagram (SSD)?
a. Determine which other messages must be sent.
b. Add all objects that must collaborate.
c. Replace the :System object with all of the internal objects and messages within the system.
d. Select an input message from the use case.
____ 24. User interface objects in a sequence diagram often are labeled with the stereotype ____.
a. entity
c. control
b. view
d. persistent
____ 25. Which of the following symbols is used in a communication diagram, but not in a sequence diagram?
a. Message arrow
c. Activation lifeline
b. Object
d. Link
____ 26. Communication diagrams indicate the order of the messages with ____.
a. sequential numbers
c. arrows
b. activation lifelines
d. links
____ 27. ____ methods must be included in a design class diagram.
a. Constructor
c. Get
b. Use case specific
d. Set
____ 28. The basic package notation is a ____.
a. circle with an iconic symbol
b. tabbed rectangle
c. three component rectangle
d. rectangle with an iconic symbol
____ 29. System sequence diagrams may contain ____ frames.
a. Loop
c. Opt
b. Alt
d. All of the above
____ 30. Which is the correct syntax for an input message on a sequence diagram?
a. * [true/false condition] return-value := message-name (parameter-list)
b. [true/false condition] return-value == message name (parameter list)
c. [true/false condition] sequence# return-value := message name (parameter list)
d. * [true/false condition] sequence# return-value := message name (parameter list)
____ 31. In a sequence, when one assumes that the objects are already available to receive messages, that is considered
to be the ____.
a. perfect technology assumption.
c. perfect solution assumption
b. perfect memory assumption
d. perfect design assumption
____ 32. View layer classes should do all of the following EXCEPT ____.
a. capture clicks and data entry
c. create problem domain classes
b. start and shut down the system
d. display data fields
____ 33. The customer relationship system needs to instantiate a new customer object. How should this be done?
a. Let the factory object do it.
c. Let the controller object do it.
b. Let a view layer object do it.
d. Let another business object do it.
____ 34. Given the observer pattern,. and the method “onActionPerformed( ),” which class/interface contains the above
method?
a. The Listener interface
b. The Listener class
c. The Listenable class
d. Both the Listener interface and the Listener class
____ 35. The following notation “anOrd:Order” can be interpreted as which of the following?
a. Order is a class. anOrd is the identifier of an object in the class
b. Order is an object. anOrd is the controller for that object
c. Order is a class. anOrd is an object in that class
d. Order is an object. anOrd is the reference to that object
Completion
Complete each statement.
36. A detailed sequence diagram uses all the same elements as a system sequence diagram (SSD), except that the
____________________ object is replaced by all of the internal objects and messages within the system.
37. ____________________ are vertical rectangles in a sequence diagram that indicate when an object is
executing a method.
38. In a communication diagram, a(n) ____________________ is used to show that two items share a message.
39. Standard design techniques and templates that are recognized as good practice are called
____________________.
40. Use case ____________________ is the process of detail design for a particular use case by determining what
objects collaborate and the messages they send to each other to carry out the use case.
41. The ____________________ layer contains the user interface classes.
42. A type of interaction diagram that does not have activation lifelines is called a(n) ____________________
diagram.
43. The ____________________ pattern can be used to connect two disparate systems.
44. The ____________________ pattern is used to instantiate objects as a service.
45. The layer used to read the database is called the ____________________ layer.
Essay
46. How have the differences between programming languages and database languages driven the trend to a
multilayer design?
47. What considerations should be taken into account when choosing the type of interaction diagram for a system
design model?
48. Discuss some guidelines to follow when performing preliminary sequence diagram development.