Developing Software with UML: Object-Oriented Analysis and by Bernd Oestereich

By Bernd Oestereich

Leverage the complete energy of items and UML in any software program improvement process!-- Object-oriented research and layout: a realistic, example-driven introduction.-- completely up to date: New insurance of UML 1.4, up-to-date Java code examples, and new options for fixing difficulties that cannot be solved by means of UML alone!-- innovations for developing more desirable use case, classification, behavioral, and implementation diagrams.This example-rich publication will exhibit any developer or analyst how one can leverage the entire energy of item expertise and UML in software program improvement. absolutely up to date all through, this version displays the recent UML 1.4 common and provides very important new concepts for fixing difficulties that can not be solved by means of UML on my own. skilled item developer and mentor Bernd Oestereich starts with a wholly new two-chapter advent to object-oriented research and layout. assurance encompasses a complete bankruptcy on use case diagrams; specified introductions to the fundamental and relational parts of sophistication diagrams; in addition to vast introductions either behavioral and implementation diagrams. alongside the best way, Oestereich exhibits how one can expand the facility of UML with complicated recommendations corresponding to stereotypes and CASE device use case templates. this is often additionally the 1st object-oriented research and layout ebook with in-depth insurance of the thing Constraint Language (OCL), a strong, UML-based modeling device for specifying a big selection of item constraints, stipulations, and guards.

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This term is often confused with addressability, equality of attributes, or a unique name. Particularly in relational databases, names or similar things 8353 Chapter 2 p17-62 3/4/02 11:39 AM Page 23 Object Identity Equality vs. identity Persistence 47 Inheritance 220 23 are used as keys. Usually, these keys are then also employed to create relationships between objects or entities. However, such names are only partly suited to identify an object, because the identity of an object (for example a car) usually does not depend on its attributes (for example the number plate).

One table is created for each concrete class. To load an object, only one single record needs to be read. Disadvantage: when reading a set of objects belonging to a common subclass or abstract class, partial sets of different tables need to be assembled. For simplification purposes, appropriate database views can be defined. e. for each concrete object type 8353 Chapter 2 p17-62 3/4/02 11:39 AM Page 50 50 O b j e c t - o r i e n t a t i o n f o r b e g i n n e r s A further disadvantage: attributes of superclasses are strewn across different tables.

Below the superior group of insects, we find subgroups such as flying insects and primitive insects (without wings). These groups are further subdivided into insects with one pair of wings, insects with two pairs of wings, and so on. The important factor of this hierarchy (see Fig. 10) is that all insects of a class have identical properties and that derived subclasses represent a specialization. Subclasses derived from a class automatically have all properties of the superior class. Thus, properties are inherited.

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