Material From System Analysis and Design Ch1

Object Modeling True / False 1. Some objects might have a few attributes; others might have dozens. a. True b. Fals e ANSWER: True Some objects might have a few attributes; others might have RATIONALE: dozens. 2. Just as objects are similar to adjectives, attributes resemble verbs that describe what and how an object does something. a. True b. Fals e ANSWER: False RATIONALE: Just as objects are similar to nouns and attributes are similar to adjectives, methods resemble verbs that describe what and how an object does something. 3. The same message to two different objects produces the same results. a. True b. Fals e ANSWER: False RATIONALE: The same message to two different objects can produce different results. 4. A use case represents the steps in a specific business function or process. a. True b. Fals e ANSWER: True RATIONALE: A use case represents the steps in a specific business function or process. 5. By limiting access to internal processes, an object prevents its internal code from being altered by another object or process. a. True b. Fals e True ANSWER: By limiting access to internal processes, an object prevents its internal code RATIONALE: from being altered by another object or process. 6. Use cases cannot interact with other use cases. a. True b. Fals e ANSWER: False RATIONALE: Use cases can interact with other use cases. 7. When use cases are identified, all the related transactions should be kept separate. a. True b. Fals e ANSWER: False RATIONALE: When use cases are identified, all the related transactions should be grouped into a single use case. 8. Class diagrams evolve into code modules, data objects, and other system components. a. True b. Fals e ANSWER: True RATIONALE: system Class diagrams evolve into code modules, data objects, and other components. 9. In a state transition diagram, the states appear as rounded rectangles with the state names inside. a. True b. Fals e ANSWER: True RATIONALE: In a state transition diagram, the states appear as rounded rectangles with the state names inside. 10. A class diagram resembles a horizontal flowchart that shows the actions and events as they occur. a. True b. Fals e ANSWER: RATIONALE: False An activity diagram resembles a horizontal flowchart that shows the actions and events as they occur. 11. A method is like a blueprint or template for all the objects within a class. a. True b. Fals e ANSWER: False RATIONALE: A class is like a blueprint or template for all the objects within a class. 12. In a state transition diagram, the circle at the right with a hollow border is the initial state. a. True b. Fals e ANSWER: False RATIONALE: In a state transition diagram, the circle at the right with a hollow border is the final state. 13. After one identifies a system’s objects, classes, and relationships, one should develop an object relationship diagram that provides an overview of the system. a. True b. Fals e ANSWER: True RATIONALE: After one identifies a system’s objects, classes, and relationships, one should develop an object relationship diagram that provides an overview of the system. 14. An object represents a real person, place, event, or transaction. a. True b. Fals e ANSWER: True An object represents a real person, place, event, or transaction. RATIONALE: 15. An object includes data, but not the processes that affect that data. a. True b. Fals e ANSWER: False An object includes data and the processes that affect that data. RATIONALE: 16. Attributes are similar to adjectives that describe the characteristics of an object. a. True b. Fals e ANSWER: True RATIONALE: Attributes are similar to adjectives that describe the characteristics of an object. 17. A method is an adjective that describes the object’s current status. a. True b. Fals e False ANSWER: Methods are tasks or functions that the object performs when it receives a RATIONALE: message, or command, to do so. 18. A control is a specific member of a class. a. True b. Fals e ANSWER: False RATIONALE: An instance is a specific member of a class. 19. The strongest relationship among objects is called inheritance. a. True b. Fals e True ANSWER: RATIONALE: The strongest relationship is called inheritance. 20. Although the UML can be used for business process modeling and requirements modeling, it is mainly used to support O-O system analysis and to develop object models. a. True b. Fals e ANSWER: RATIONALE: object models. True Although the UML can be used for business process modeling and requirements modeling, it is mainly used to support O-O system analysis and to develop 21. Classes that send or receive messages are shown at the bottom of the sequence diagram. a. True b. Fals e ANSWER: False RATIONALE: Classes that send or receive messages are shown at the top of the sequence diagram. 22. A star marks the end of the lifeline. a. True b. Fals e ANSWER: False RATIONALE: An X marks the end of the lifeline. 23. The focus indicates when an object sends or receives a message. a. True b. Fals e ANSWER: True RATIONALE: The focus indicates when an object sends or receives a message. 24. There are few CASE tools tailored to UML. a. True b. Fals e ANSWER: False There are many CASE tools tailored to UML. RATIONALE: 25. Object-oriented (O-O) analysis describes an information system by identifying things called objects. a. True b. Fals e True ANSWER: RATIONALE: Object-oriented (O-O) analysis descr ibes an information system by identifying things called objects. 26. Systems analysts define an object’s attributes during the systems design process. a. True b. Fals e ANSWER: True RATIONALE: Systems analysts define an object’s attributes during the systems design process. 27. Systems analysts can create diagrams that appear to be correct but are in fact incorrect when it comes to the rules of the UML. a. True b. Fals e True ANSWER: RATIONALE: Systems analysts can create diagrams that appear to be correct but are in fact incorrect when it comes to the rules of the UML. 28. A black box wants and needs outside interference. a. True b. Fals e ANSWER: False A black box does not want or need outside interference. RATIONALE: 29. Encapsulation allows objects to be used as modular components anywhere in the system. a. True b. Fals e True ANSWER: Encapsulation allows objects to be used as modular components RATIONALE: anywhere in the system. 30. When the outcome of one use case is incorporated by another use case, we say that the second case uses the first case. a. True b. Fals e ANSWER: True RATIONALE: When the outcome of one use case is incorporated by another use case, we say that the second case uses the first case. Multiple Choice 31. _____ is a widely used method of visualizing and documenting an information system. a. Unified Modeling Language (UML) b. The Java Virtual Machine (JVM) c. The UNiplexed Information and Computing System (UNIX) d. Multimedia Logic (ML) ANSWER: a RATIONALE: The Unified Modeling Language (UML) is a widely used method of visualizing and documenting an information system. 32. A(n) _____ represents a person, a place, an event, or a transaction that is significant to the information system. a. object b. instance c. class d. model ANSWER: a An object represents a real person, place, event, or transaction. RATIONALE: 33. An object has certain _____, which are characteristics that describe the object, such as the make, model, and color of a car. a. keys b. attributes c. indices d. elements ANSWER: RATIONALE: b An object has certain attributes, which are characteristics that describe the object. 34. An object’s _____ are the tasks or functions that the object performs when it receives a command to do so. a. roles b. utilities c. instance s d. methods d ANSWER: An object also has methods, which are tasks or functions that the object RATIONALE: performs when it receives a message, or command, to do so. 35. A car performs a(n) _____ called OPERATE WIPERS when it is sent a message with the wiper control. a. method b. role c. command d. objective a ANSWER: A car performs a method called OPERATE WIPERS when it is sent a RATIONALE: message with the wiper control. 36. An object belongs to a group or category called a(n) _____. a. aggregate b. concatenation c. class d. packet c ANSWER: An object belongs to a group or category called a RATIONALE: class. 37. A(n) _____ is a specific member of a class. a. key b. index c. file d. instance ANSWER: RATIONALE: d An instance is a specific member of a class. 38. A red Mustang is a(n) _____ of the CAR class. a. index b. key c. metric d. instance ANSWER: d RATIONALE: A Toyota Camry, for example, is an instance of the CAR class. At an auto dealership, many instances of the CAR class may be observed: the TRUCK class, the MINIVAN class, and the SPORT UTILITY VEHICLE class, among others.