By Bernd Oestereich

Leverage the entire strength of items and UML in any software program improvement process!-- Object-oriented research and layout: a pragmatic, example-driven introduction.-- completely up-to-date: New insurance of UML 1.4, up to date Java code examples, and new suggestions for fixing difficulties that cannot be solved via UML alone!-- recommendations for developing more advantageous use case, category, behavioral, and implementation diagrams.This example-rich ebook will convey any developer or analyst the right way to leverage the whole strength of item expertise and UML in software program improvement. absolutely up-to-date all through, this variation displays the hot UML 1.4 normal and offers vital new innovations for fixing difficulties that can not be solved by way of UML by myself. skilled item developer and mentor Bernd Oestereich starts off with a completely new two-chapter creation to object-oriented research and layout. assurance features a complete bankruptcy on use case diagrams; specific introductions to the fundamental and relational components of sophistication diagrams; in addition to vast introductions either behavioral and implementation diagrams. alongside the best way, Oestereich exhibits tips to expand the ability of UML with complicated options akin to stereotypes and CASE device use case templates. this is often additionally the 1st object-oriented research and layout publication with in-depth assurance of the item Constraint Language (OCL), a robust, UML-based modeling device for specifying a big selection of item constraints, stipulations, and guards.

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Additional info for Developing Software with UML: Object-Oriented Analysis and Design in Practice (2nd Edition)

Example text

A database. Thus, persistent objects are long-term storable objects. All other objects are transient objects. Objects that are stored but do not exist in the running program are called passive objects, while instances that exist at runtime are called active objects. Persistent objects may contain data exclusively contained in the active object. The data is computed during creation or loading of the object or is added during execution, but is not taken into consideration for later storage. Creation and loading of objects is carried out by special operations.

This is a case of is-a semantics: a circle is a geometric figure. Objects of derived classes can always be employed instead of objects of their base class(es) (substitution principle). ) Superclasses and subclasses are frequently differentiated by means of a distinctive feature, the so-called discriminator. In the example above, we differentiate by figure shape. 12 Generalization/specialization Multiple inheritance 224 Problems with inheritance 31 The above illustration showing the hierarchy of geometric objects is an example of so-called simple inheritance.

Differential programming is a politically correct name for object-oriented legacy hunting. In the generalization or specialization process of classes, a subclass inherits the properties of its superclass, but it must also assume its responsibilities and tasks, at least in principle. e. further developed, and new features may be added. Existing properties, however, should be neither suppressed nor restricted. But how are properties arranged inside an inheritance hierarchy? Fundamentally, properties are situated precisely in those classes where, according to the responsibility assigned to them, they are effectively a property of the class.

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