By Mike O'Docherty
ISBN-10: 0470092408
ISBN-13: 9780470092408
Overlaying the breadth of a giant subject, this e-book offers a radical grounding in object-oriented techniques, the software program improvement strategy, UML and multi-tier applied sciences. After overlaying a few easy floor paintings underpinning OO software program tasks, the ebook follows the stairs of a customary improvement venture (Requirements seize - layout - Specification & Test), displaying how an summary challenge is taken via to a concrete resolution. The publication is programming language agnostic - so code is stored to a minimal to prevent aspect and deviation into implementation minutiae.
A unmarried case learn operating in the course of the textual content presents a practical instance displaying improvement from an preliminary suggestion via to a accomplished process. Key artifacts reminiscent of the necessities rfile and unique designs are incorporated. for every point of the case examine, there's an workout for the reader toproduce comparable files for a unique approach.
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Extra resources for Object-Oriented Analysis & Design UnderstandingSystemDevelopment with UML 2
Sample text
It would then be much harder to change the internal representation of the object in the future, because we’d have to find all the pieces of code that access the attributes directly and change those too. Without encapsulation we would lose simplicity and locality. As an example of why encapsulation is a good idea, consider an object representing a circle. A circle would be likely to have operations allowing us to discover its radius, diameter, area and perimeter. What attributes would we need to store in order to support this behavior?
Because information and services such as those listed above don’t seem to fit well with objects, object-oriented languages usually allow the programmer to put elements onto the class itself. So, as well as field, message and method, we have class field, class message and class method. Java programmers, for example, can use the keyword static to indicate that an element is associated with the whole class rather than any of its instances. Some languages go so far as to treat the class as an object in its own right.
But not to ‘Start the engine’. As mentioned earlier, objects are courteous: when an object receives a message, it carries out the request without question. This way, the sending object doesn’t need to cope with 27 28 Chapter 2 What's the time? aClock 14:40 What is your name? 12: Some example messages the possibility of a message being refused. In practice, some requests can’t be carried out, despite the best intentions of the receiver. 1. Sometimes, we can’t allow things to fail: we would be rather disappointed if a fly-by-wire plane crashed because of a software fault.
Object-Oriented Analysis & Design UnderstandingSystemDevelopment with UML 2 by Mike O'Docherty
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