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  • Question
  • An abstract class is which of the following?


  • Options
  • A. A class that has direct instances, but whose descendants may have direct instances.
  • B. A class that has no direct instances, but whose descendants may have direct instances.
  • C. A class that has direct instances, but whose descendants may not have direct instances.
  • D. A class that has no direct instances, but whose descendants may not have direct instances

  • Correct Answer
  • A class that has no direct instances, but whose descendants may have direct instances. 


  • Object-Oriented Data Modeling problems


    Search Results


    • 1. An object can have which of the following multiplicities?

    • Options
    • A. Zero
    • B. One
    • C. More than one
    • D. All of the above.
    • Discuss
    • 2. The benefits of object-oriented modeling are which of the following?

    • Options
    • A. The ability to tackle more challenging problems
    • B. Reusability of analysis, design, and programming results
    • C. Improved communication between users, analysts, etc.
    • D. All of the above.
    • Discuss
    • 3. Which of the following statement is true concerning objects and/or classes?

    • Options
    • A. An object is an instance of a class.
    • B. A class is an instance of an object.
    • C. An object includes encapsulates only data.
    • D. A class includes encapsulates only data.
    • Discuss
    • 4. A UML diagram includes which of the following?

    • Options
    • A. Class name
    • B. List of attributes
    • C. List of operations
    • D. All of the above.
    • Discuss
    • 5. Which of the following applies to a class rather than an object?

    • Options
    • A. Query
    • B. Update
    • C. Scope
    • D. Constructor
    • Discuss
    • 6. Composition is a stronger form of which of the following?

    • Options
    • A. Aggregation
    • B. Encapsulation
    • C. Inheritance
    • D. All of the above.
    • Discuss
    • 7. A constructor operation does which of the following?

    • Options
    • A. Creates a new instance of a class
    • B. Updates an existing instance of a class
    • C. Deletes and existing instance of a class
    • D. All of the above.
    • Discuss
    • 8. In an enterprise-class database system, business users interact directly with database applications, which directly access the database data.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. One of the reasons why OODBMSs have not been widely used for business information systems is that OOP is obsolete.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. Enterprise Resource Planning (ERP) is an example of a single user database.

    • Options
    • A. True
    • B. False
    • Discuss


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