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relationship, the base class (the more general class) will contain all common attributes. The derived class (the more specialized class) will inherit all the common attributes from the base class. For example, if one group of entities consists of vehicles and the other group of cars, we can use inheritance. The cars can inherit from the vehicles. The cars can share many of the attributes and operations of the vehicle class. All the common attributes can be located in the base class. The derived class will automatically inherit those attributes. This sharing saves e ort.
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EXAMPLE 11.1
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Draw an object model that identifies all the commonalities between cars and vehicles. Fig. 11-1 shows that cars and vehicles both have bodies, engines, wheels (maybe not four), headlights, brand names, manufacturer, and cost. (There are probably many more.)
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vehicles name manufacturer cost body engine wheels headlights
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Fig. 11-1
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EXAMPLE 11.2
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Draw an object model that identifies the commonalities in a library system that handles books, magazines, pamphlets, movie videotapes, music CDs, audio book tapes, and newspapers. Figure 11-2 shows that all of these items have titles, publishers, acquisition dates, catalog numbers, shelf location, loan status, and checkout limits. Some example attributes have been added to some of the derived classes. Note that audiobook could be derived from book, and newspaper and magazine could both be derived from an object called serial or periodical.
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library item title publisher acquisition date catalog number shelf location loan status checkout limits
book author
magazine date
pamphlet
video
cd artist
audiobook author
newspaper date
Fig. 11-2
11.1.2 POLYMORPHISM
Polymorphism means able to assume many forms. It refers to functions that can deal with di erent versions or forms of the object or parameter list. In objectoriented software, it often means a function that can deal with the base type or a derived type. In the car/vehicle example, the base class will have polymorphic functions for tasks that all vehicles perform but may perform di erently, such as turn corners. Each derived class will either use the base class function or provide a version that is suitable for the derived class.
EXAMPLE 11.3
Find the functions in the library problem (Example 11.2) that can be common for all of the items and the functions that will have to be specialized for the derived class. Common Checkout and check in functions (except maybe for checkout limitations). Specialized Cataloging functions will differ.
Identifying Objects
One approach to identifying the requirements of a proposed system is to start with identifying the objects in the problem domain. These objects are usually nouns in the problem statement.
11.2.1 THE NOUN-IN-TEXT APPROACH
In the noun-in-text approach, all the nouns in the text are identi ed. Di erent nouns may be used for the same concept. These equivalent nouns and nouns associated with each concept should be sorted into groups. Some nouns will be related to the environment outside of the proposed system and may be removed.
Object-Oriented Development
In each group, nouns representing the objects should be selected. Other nouns in the group may become attributes or may be discarded.
EXAMPLE 11.4
Use the noun-in-text-description method to identify the objects from the following grocery store problem: A grocery store wants to automate its inventory. It has point-ofsale terminals that can record all of the items and quantities that a customer purchases. It has a similar terminal for the customer service desk to handle returns. It has another terminal in the loading dock to handle arriving shipments from suppliers. The meat department and the produce departments have terminals to enter losses/discounts due to spoilage. Nouns: grocery store, inventory, point-of-sale terminals, items, quantities, customer, purchases, service desk, returns, loading dock, shipments, suppliers, meat department, produce department, losses, discounts Groups: grocery store inventory, items, quantities, returns, losses, discounts shipments suppliers meat department, produce department customers Environment entities that are external to system: point-of-sale terminals, service desk, loading dock, meat department, produce department However, meat items and produce items should be included to reflect the different processing. There is a choice of whether customers are external to the system or the system knows and tracks customers. The decision is made to track customers. Final list of objects and attributes: grocery store inventory items with an attribute of quantity customer purchases returns shipments suppliers losses discounts meat items produce items See Fig. 11-3.
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