Object-Oriented Analysis and Design for Information Systems by Raul Sidnei Wazlawick

Author:Raul Sidnei Wazlawick
Language: eng
Format: epub
ISBN: 9780124172937
Publisher: Elsevier Inc.
Published: 2014-01-27T16:00:00+00:00

6.9 The process so far

6.10 Questions

1. Try to imagine a real world situation where the right structure to be used is a sequence. Remember that a real sequence allows elements to be repeated and assigns position to elements. Try not to get fooled by natural language use of the word “list.” A “grocery list,” for example, is not a sequence, because elements do not repeat and their position in the list is irrelevant; a student roll call may be organized in alphabetical order, but again, repetition is not allowed and the order is again irrelevant although convenient. Thus, those are not real sequences.

2. What is the purpose of the controller class? What is its relation with dependent and independent concepts?

3. Why should an attribute not be typed with a class name? Why should an attribute not be used to reference another class?

4. Elaborate a list of concepts and subconcepts (subtypes of the original concept, as, for example, dog and beagle) from common sense. Then, try to identify the type of each relation: structural, associative, or temporal. Try to have at least one example of each type in your list.

5. What is the difference between a normal association, an aggregation, and a composition?

6. List some examples of data types that could be defined as primitive.

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