Download e-book for kindle: Object Technology: A Manager's Guide by David A. Taylor

By David A. Taylor

ISBN-10: 0201309947

ISBN-13: 9780201309942

This ebook rocks. brief, candy, but whole. it is the most sensible advent to object-oriented recommendations round. cash good spent.

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Example text

Your new, combined hierarchy is to look like the one in the accompanying figure. A combined vehicle hierarchy Notice that your Vehicle class is now the superclass for vehicles of all kinds and that there is a new OperatedVehicle class that brings together what used to be its immediate subclasses. Because Vehicle is now playing a more general role, you would need to take any definitions that pertain to a human operator (such as authorizing operation and identifying the current operator) out of Vehicle and move them down into the OperatedVehicle class.

If the variables in these objects are constrained to hold an instance of the Product class or one of its subclasses, then we can be assured that all the objects involved in selling will be talking to an object that knows how to tell us a price, transfer ownership, and perform other functions related to sales. But suppose you decide to sell off some used equipment or an unprofitable business unit. These are not products, so none of the objects involved in sales will be able to reference them as the object of a sale.

A BOM in an object database Support for Inheritance Built-in support for inheritance not only meets the needs of storing objects, it also brings an unprecedented level of flexibility to information storage. A common restriction imposed by conventional databases is that all entries of a given type must conform to the same structure. If new entries require a different structure, there are only two choices: force the new entries into the existing structure or define a new structure that includes the new requirements and convert all existing entries to fit it.

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