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Determine the multiplicities for the student-section problem from Example 11.12. All instances have to be related to exactly one parent instance. All parents have to be related to 1 to n child instances. For example, a college without courses is not allowed (by this model). For example, 0.. , specifies that there can be zero or more relationships. And, every course has to be associated with one college. See Fig. 11-11.
1 students 1..n student
college
courses
1..n course
sections 1..n section
taken by 1..n 1..n enrollment
1 taking
Fig. 11-11
Review Questions
1. Why is a Ford automobile a specialization of a car and an engine is not 2. What is the di erence between an object and an attribute 3. What are the goals of domain analysis
Object-Oriented Development
Problems
1. Identify the objects from the following B&B problem statement: Tom and Sue are starting a bed-and-breakfast in a small New England town. They will have three bedrooms for guests. They want a system to manage the reservations and to monitor expenses and pro ts. When a potential customer calls for a reservation, they will check the calendar, and if there is a vacancy, they will enter the customer name, address, phone number, dates, agreed upon price, credit card number, and room number(s). Reservations must be guaranteed by 1 day s payment. Reservations will be held without guarantee for an agreed upon time. If not guaranteed by that date, the reservation will be dropped. 2. Identify the objects from the following dental o ce problem statement: Tom is starting a dental practice in a small town. He will have a dental assistant, a dental hygienist, and a receptionist. He wants a system to manage the appointments. When a patient calls for an appointment, the receptionist will check the calendar and will try to schedule the patient as early as possible to ll in vacancies. If the patient is happy with the proposed appointment, the receptionist will enter the appointment with patient name and purpose of appointment. The system will verify the patient name and supply necessary details from the patient records including the patient s ID number. After each exam or cleaning, the hygienist or assistant will mark the appointment as completed, add comments, and then schedule the patient for the next visit if appropriate. The system will answer queries by patient name and by date. Supporting details from the patient s records are displayed along with the appointment information. The receptionist can cancel appointments. The receptionist can print out a noti cation list for making reminder calls 2 days before appointments. The system includes the patient s phone numbers from the patient records. The receptionist can also print out daily and weekly work schedules with all the patients. 3. Draw an object model for the B&B problem (Problem 11.1). 4. Draw an object model for the dental o ce problem (Problem 11.2).
Answers to Review Questions
1. Why is a Ford automobile a specialization of a car and an engine is not A Ford automobile would have the same attributes and functions that a base class for cars would have. Thus, a Ford automobile could be derived from that car base class.
Object-Oriented Development
However, an engine is a part of a car and not a specialization of a car. There are many functions and attributes of cars that an engine would not have. Thus, an engine could not be derived from a car base class. 2. What is the di erence between an object and an attribute An object is an entity, while an attribute is a characteristic of that object. For example, a person would be an object and the person s height would be an attribute. Sometimes the distinction may be hard. In the person/height example, person may be a base class and there may be derived classes for tall person, short person, and medium-height person. 3. What is the goal of domain analysis The goal of domain analysis is to identify the parts that would be best to reuse in future systems. The approach is to nd commonality among possible systems in the problem domain.
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