Question

What is the main source of lower-level objects in object-oriented design?

a.

Domain-specific entities

b.

Class libraries

c.

Application-dependent interaction

d.

None of the above

Posted under Software Engineering

Answer: (b).Class libraries Explanation:The lower-level objects used in object-oriented design can often be taken from class libraries, which already exist for various object-oriented programming languages. The lower-level objects are used to implement the domain-specific entities, which are identified during the first modeling stages and constitute the middle level of the system.

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