Transcript
Chapter 10 Object-Oriented Analysis and Modeling using UML
True/False Questions
1. Object-oriented analysis (OOA) techniques are used to (1) study existing objects to see if they can be reused or adapted for new uses; and (2) define new or modified objects that will be combined with existing objects into a useful business computing application.
Answer: True
2. An object is something that is or is capable of being seen, touched, or otherwise sensed, and about which users store data and associate behavior.
Answer: True
3. Attributes are the data that represents characteristics of interest about an object.
Answer: True
4. An attribute is something that is or is capable of being seen, touched or otherwise sensed, and about which users store data and associate behavior.
Answer: False
Rationale: This describes an object, not an attribute.
5. Behavior refers to those things that the object can do and that correspond to functions that act on the object's data (or attributes). This is commonly referred to as a method, operation or service.
Answer: True
6. Behavior is the packaging of several items together into one unit.
Answer: False
Rationale: This describes encapsulation, not behavior.
7. An object class is a set of object instances that share the same attributes and behavior.
Answer: True
8. An object instance is a set of object classes that share the same attributes and behavior.
Answer: False
Rationale: An object class is a set of object instances that share the same attributes and behavior.
9. Inheritance means that methods and attributes defined in an object class can be inherited or reused by another object class.
Answer: True
10. A supertype is an object class whose instances store attributes that are common to one or more subtypes of the object class.
Answer: True
11. A subtype is an object class whose instances store attributes that are common to one or more supertypes of the object class.
Answer: False
Rationale: A supertype is an object class whose instances store attributes that are common to one or more subtypes of the object class.
12. An object class relationship is a natural business association that exists between one or more object classes.
Answer: True Page: 376
13. A message is passed when one object invokes one or more of another object's methods (behaviors) to request information or some action.
Answer: True
14. An attribute is passed when one object invokes one or more of another object's methods (behaviors) to request information or some action.
Answer: False
Rationale: A message is passed when one object invokes one or more of another object's methods (behaviors) to request information or some action.
15. Polymorphism means "many forms." Applied to object-oriented techniques, it means that the same named behavior may be completed differently for different object classes.
Answer: True
16. Encapsulation means "many forms." Applied to object-oriented techniques, it means that the same named behavior may be completed differently for different object classes.
Answer: False
Rationale: Polymorphism means "many forms." Applied to object-oriented techniques, it means that the same named behavior may be completed differently for different object classes.}
17. Use case diagrams graphically depict the interactions between the system and external systems and users. In other words, they graphically describe who will use the system and in what ways the user expects to interact with the system.
Answer: True
18. Activity diagrams depict the sequential flow of a use case or business process.
Answer: True
19. Class diagrams depict the system's object structure. They show object classes that the system is composed of as well as the relationships between those classes.
Answer: True
20. There are thirteen diagrams used in UML 2.0.
Answer: True Page: 381
21. The current version of UML is 3.0.
Answer: False
Rationale: The current version of UML is 2.0.
22. The UML does not prescribe a method for developing systems – only a notation for modeling.
Answer: True
23. Class diagrams model how events can change the state of an object class over its lifetime.
Answer: False
Rationale: This describes State Machine diagrams.
24. A subtype can have a behavior with the same name as a behavior in it's supertype.
Answer: True
25. The only way to access or change an object's attributes is through that object's behaviors.
Answer: True
26. If exam is an object class, then your exam paper is an object instance.
Answer: True
27. An object class can be referred to simply as a class.
Answer: True
28. A Student object class and a Teacher object class would have a supertype/subtype relationship.
Answer: False Page: 373-375
Rationale: Both Student and Teacher would be subtypes of a Person object class.
29. The concept of multiplicity is essentially the same concept as cardinality in data modeling
Answer: True
30. In UML 2.0 the notation for composition has been dropped.
Answer: False
Rationale: In UML 2.0 the notation for aggregation has been dropped.
31. Composition is drawn with a filled diamond.
Answer: True
32. One of the UML 2.0 diagrams is the collaboration diagram.
Answer: False
Rationale: The collaboration diagram was renamed the communication diagram in UML 2.0.
33. The UML version 1.0 was released in 1997.
Answer: True
34. An activity diagram can be used to model logic with the system.
Answer: True
35. A student object class might have a behavior called withdrawFromUniversity.
Answer: True
36. A student object class might have am attribute called withdrawFromUniversity.
Answer: True
Rationale: That would be a behavior, not an attribute.
37. Multiplicity is the minimum and maximum number of occurrences of one object class for a single occurrence of the related object class.
Answer: True
38. Aggregation is a stronger form of composition.
Answer: False
Rationale: Composition is a stronger form of aggregation.
39. In an e-commerce information system the relationship of a shopping cart object class to a shopping cart item object class would be a generalization/specialization.
Answer: False
Rationale: It would a composition relationship.
40. In object-oriented analysis, the requirements use-case model is used as is.
Answer: False Page: 383
Rationale: The requirements use-case model is refined into an analysis use-case model.
41. Once all the requirements use cases have been reviewed and approved by the users, each use case will be refined to include more information to specify the system functionality in detail. The resulting use cases are called analysis use cases and should represent any implementation specifics.
Answer: False Page: 383
Rationale: The analysis use cases should still be implementation independent.
42. A use case may contain complex functionality consisting of several steps that are difficult to understand. To simplify the use case and make it more easily understood, we could extract the more complex steps into their own use cases. This type of use case is called an extension use case in that it extends the functionality of the original use case.
Answer: True
43. An abstract use case represents a form of "reuse."
Answer: True
44. An abstract use case is available for referencing (or use) by any other use case that requires its functionality.
Answer: True
45. New use cases may be added during object-oriented analysis.
Answer: True
46. New actors may be added to a use-case diagram during object-oriented analysis.
Answer: True Page: 383
47. In composition, the "whole" is responsible for the creation and destruction of its parts.
Answer: True
48. A class is said to be persistent if it outlives the execution of a program.
Answer: True
49. The steps of a use case can be modeled with an activity diagram.
Answer: True Page: 390
50. An activity diagram begins with an initial node.
Answer: True Page: 391
51. At least one activity diagram can be constructed for each use case.
Answer: True Page: 391
52. To specify who does what, you can divide an activity diagram into flows.
Answer: False Page: 391
Rationale: To specify who does what, you can divide an activity diagram into partitions.
53. Every flow on an activity diagram needs words to identify them.
Answer: False Page: 391
Rationale: Most flows do not need words to identify them unless coming out of decisions.
54. On an activity diagram all actions coming into a fork must be completed before processing continues.
Answer: False Page: 391
Rationale: On an activity diagram all actions coming into a join must be completed before processing continues.
55. On an activity diagram a subactivity indicator indicates a separate activity diagram.
Answer: True Page: 391
56. A system sequence diagram depicts the interaction between an actor and the system for a use case scenario.
Answer: True Page: 394
57. In a system sequence diagram lifelines indicate the period of time when the participant is active in the interaction.
Answer: False Page: 394
Rationale: Activation bars indicate the period of time when the participant is active in the interaction
58. In a system sequence diagram an input message called finalizeOrder would be proper according to UML convention.
Answer: True Page: 394
59. In a system sequence diagram a frame can show loops or optional steps.
Answer: True Page: 395
60. An object association matrix is a tool for prioritizing use cases.
Answer: False Page: 400
Rationale: An object association matrix is a tool for determining object class relationships.
61. Every object class should have a primary key attribute identified.
Answer: False
Rationale: There is no need in a class diagram to include a primary key attribute unless it is a real business attribute.
62. There is no need for foreign keys in a class diagram.
Answer: True
Multiple Choice Questions
63. The data associated with an object are called:
A) behaviors
B) attributes
C) inheritance
D) encapsulation
E) polymorphism
Answer: A
64. In object-oriented analysis we evolve the requirements use case model into the analysis use-case model by performing the following steps:
A) identify, define and document new actors
B) identify, define and document new use cases
C) .identify any reuse possibilities
D) refine the use case model diagram
E) all of these
Answer: E Page: 383
65. The messages of a use case can be graphically depicted with a(n):
A) system analysis use case
B) use case diagram
C) activity diagram
D) system sequence diagram
E) none of these
Answer: D Page: 394
66. In an activity diagram you would combine flows that were previously separated by decision using a(n):
A) merge
B) fork
C) join
D) connector
E) none of these
Answer: A Page: 391
67. If an object class outlives the execution of the program, it is said to be:
A) permanent
B) transient
C) persistent
D) an instance
E) none of these
Answer: C
68. Which of the following people were not involved in developing object-oriented analysis?
A) Grady Booch
B) E.F. Codd
C) Ivar Jacobson
D) James Rumbaugh
E) all of these were involved in developing object-oriented analysis
Answer: B Page: 370-371
69. A set of modeling conventions that is used to specify or describe a software system in terms of objects is:
A) data flow diagrams
B) object flow diagrams
C) attribute object diagrams
D) unified modeling language
E) none of these
Answer: D
70. The packaging of an object with its behaviors is called:
A) behaviors
B) attributes
C) inheritance
D) encapsulation
E) polymorphism
Answer: D
71. Those things that an object can do and that correspond to functions that act on the object's data (or attributes) is known as a(n):
A) method
B) behavior
C) operation
D) service
E) all of these
Answer: E
72. Which type of class relationship can be described as "is part of" or "is composed of"?
A) generalization/specialization
B) association
C) aggregation
D) multiplicity
E) inheritance
Answer: C
73. The condition where the methods and/or attributes defined in an object class can be inherited or reused by another object class is known as:
A) encapsulation
B) generalization
C) inheritance
D) specialization
E) none of these
Answer: C
74. A technique wherein the attributes and behaviors are common to several types of object classes are grouped into their own class, called a supertype, is known as:
A) encapsulation
B) generalization
C) inheritance
D) generalization/specialization
E) none of these
Answer: D
75. An object class whose instances inherit some common attributes from a class supertype and then add other attributes that are unique to its instances is known as:
A) a supertype
B) a subtype
C) a behavior
D) a message
E) none of these
Answer: B
76. What defines how many instances of one object class can be associated with one instance of another object class?
A) associativity
B) multiplicity
C) relationship
D) inheritance
E) none of these
Answer: B
77. Diagrams that depict the system's object structure and show object classes that the system is composed of as well as the relationships between those object classes are known as:
A) use case diagrams
B) class diagrams
C) object diagrams
D) sequence diagrams
E) none of these
Answer: B
78. Which type of class relationship can be described as "is a"?
A) generalization/specialization
B) association
C) aggregation
D) multiplicity
E) inheritance
Answer: A
79. In a Class Diagram a multiplicity of zero or more would be designated by:
A) 0..*
B) 0-*
C) a crow's foot
D) a 0 and a vertical line
E) none of these
Answer: A Page: 377
80. Which kind of diagram shows aggregation?
A) activity diagram
B) class diagram
C) system sequence diagram
D) class relationship diagram
E) none of these
Answer: A
81. In a system sequence diagram, the system is depicted as:
A) a single box
B) one or more rounded rectangles
C) lifelines
D) object classes
E) none of these
Answer: A Page: 394
82. Which of the following can NOT be shown in a system sequence diagram?
A) a receiver actor
B) loops
C) optional steps
D) object classes
E) system outputs
Answer: C Page: 394-395
83. Which of the following can NOT be shown in an activity diagram?
A) decisions
B) concurrent actions
C) actors
D) UML convention for messages
E) none of these
Answer: C Page: 391
84. Which of the following messages uses proper UML notation?
A) Item Selections
B) ItemSelections(items, quantities)
C) ItemSelections(Items, Quantities)
D) itemSelections(items, quantities)
E) Itemselections(ITEMS,QUANTITIES)
Answer: C Page: 394
Fill in the Blank Questions
85. The use case _____________________________ is used to textually describe the sequence of steps of each interaction.
Answer: narrative
86. ________________________ diagrams depict the system's object structure. They show object classes that the system is composed of as well as the relationships between those classes.
Answer: Class
87. _____________________________ diagrams depict the interaction between an actor and the system for a use case scenario.
Answer: System sequence Page: 394
88. __________________________________ diagrams graphically depict how objects interact with each other via messages in execution of a use case or operation. They illustrate how messages are sent and received between objects and in what sequence.
Answer: Sequence
89. ___________________________________ are set over the lifelines in a system sequence diagram to indicate the period of time when the participant is active in the interaction.
Answer: Activation bars Page: 394
90. A behavior in a subtype is said to _____________ a behavior with the same name in its supertype.
Answer: override
91. In an activity diagram the diamond shape is used to represent a __________ or a ____________.
Answer: decision, merge Page: 391
92. In an activity diagram a rake symbol is used to represent a ______________________.
Answer: subactivity indicator (action broken out in another activity diagram)
Page: 391
93. In an activity diagram a black bar with tow or more flows coming in an one flow going out is called a ________________.
Answer: join Page: 391
94. To show who does what in an activity diagram you would divide it into _____________.
Answer: partitions (swimlanes) Page: 391
95. To show loops in a system sequence diagram you would use a _____________.
Answer: frame Page: 395
96. _____________________________. is a relationship in which one larger "whole" class contains one or more smaller "parts" classes.
Answer: Aggregation (or composition)
97. If an object class called Supplier has a behavior called sendEmail and an object class called Customer has a behavior called sendEmial, that is an example of ___________________.
Answer: polymorphism
98. The version of the use case created during requirements analysis is called a(n) ______________________ use case.
Answer: requirements Page: 383
99. If Supplier was an object class, supplier phone number would be a(n) __________________.
Answer: attribute
100. A use case may contain complex functionality consisting of several steps that are difficult to understand. To simplify the use case and make it more easily understood, we could extract the more complex steps into their own use cases. This type of use case is called a(n) ______________________________ use case in that it extends the functionality of the original use case.
Answer: extension
101. A(n) ________________________________ use case can be invoked only by the use case it is extending.
Answer: extension
102. A(n) ___________________________ use case is used to define a use case that has a sequence of common steps that can be used by other use cases. It represents a form of "reuse."
Answer: abstract
103. ___________________ is a stronger form of __________________.
Answer: Composition, aggregation
104. _________________________________ is a type of association that is often referred to as a whole/part relationship..
Answer: Aggregation (composition)
105. An object class is said to be ______________________________ if it outlives the execution of a program.
Answer: persistent
106. When a class is persistent, it means the objects the class describes will be stored in a _____________________________________.
Answer: database
107. Object classes that are created temporarily by a software program are called ______________________.
Answer: transient objects
108. UML 1.0 was released in the year _________.
Answer: 1997
109. ___________________________________ techniques are used to (1) study existing objects to see if they can be reused or adapted for new uses; and (2) define new or modified objects that will be combined with existing objects into a useful business computing application.
Answer: Object-oriented analysis (OOA)
110. ____________________________ is a technique for identifying objects within the systems environment and the relationships between those objects.
Answer: Object modeling Page: 360
111. The _________________________________________ is a set of modeling conventions that is used to specify or describe a software system in terms of objects.
Answer: Unified Modeling Language (UML)
112. A(n) ______________________________ is something that is, or is capable of being seen, touched, or otherwise sensed, and about which users store data and associate behavior.
Answer: object
113. _______________________________ are the data that represent characteristics of interest about an object.
Answer: Attributes
114. _________________________ refers to those things that the object can do and that correspond to functions that act on the object's data (or attributes). This is commonly referred to as a method, operation or service.
Answer: Behavior
115. _________________________________ is the packaging of several items together into one unit. It is also called information hiding.
Answer: Encapsulation
116. A(n) ___________________________ is a set of objects that share the same attributes and behavior. It is sometimes referred to as an object class.
Answer: object class
117. ___________________________________ means that methods and attributes defined in an object class can be inherited or reused by another object class.
Answer: Inheritance
118. ___________________________________ is a technique wherein the attributes and behaviors that are common to several types of object classes are grouped into their own class, called a supertype. The attributes and methods of the supertype object class are then inherited by those object classes.
Answer: Generalization/specialization
119. A(n) _______________________________ is an object whose instances store attributes that are common to one or more class subtypes of the object.
Answer: supertype
120. A(n) _____________________________ is an object class whose instances inherit some common attributes from a class supertype and then add other attributes that are unique to an instance of it.
Answer: subtype
121. A(n) ________________________________________ is a natural business association that exists between one or more object/classes.
Answer: object class relationship Page: 376
122. ___________________________________ defines how many instances of one object/class can be associated with one instance of another object/class.
Answer: Multiplicity
123. A(n) __________________________________ is passed when one object invokes one or more of another object's methods (behaviors) to request information or some action.
Answer: message
124. _____________________________________ means "many forms." Applied to object-oriented techniques, it means that the same named behavior may be completed differently for different objects/classes.
Answer: Polymorphism
125. __________________________ diagrams depict the sequential flow of activities of a use case or business process
Answer: Activity
