By Mike O'Docherty
Protecting the breadth of a giant subject, this publication offers a radical grounding in object-oriented thoughts, the software program improvement technique, UML and multi-tier applied sciences. After overlaying a few uncomplicated 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 answer. The publication is programming language agnostic - so code is stored to a minimal to prevent aspect and deviation into implementation minutiae.
A unmarried case research operating in the course of the textual content offers a practical instance exhibiting improvement from an preliminary suggestion via to a comprehensive approach. Key artifacts corresponding to the necessities rfile and unique designs are integrated. for every element of the case research, there's an workout for the reader toproduce related records for a distinct procedure.
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Additional resources for Object-Oriented Analysis & Design UnderstandingSystemDevelopment with UML 2
3 will be used, in the manner described. An attribute can be stored (encapsulated) by an object, but it doesn’t have to be. For example, a circle has radius and diameter attributes, but we need only store the radius because the diameter can be calculated on demand. To avoid confusion, only stored attributes will be shown in this book – if necessary, derived attributes will be implied by the addition of one or more operations, such as getDiameter. A ﬁeld is not quite the same as an attribute. Firstly, a ﬁeld represents a decision to store something; secondly, a ﬁeld can be used to store a connection to another object, as shown by navigable links on our object diagrams.
The idea of a main operation applies not just to programs executed from a console – it works equally well for more exotic programs such as graphical user interfaces (GUIs), Web servers and servlets. Here are some hints as to how these work: • The main operation for a user interface creates the top-level window and tells it to show itself. • A Web server’s main operation has an inﬁnite loop telling a socket object to listen for incoming requests on some port. • A servlet is an object hosted by a Web server that receives requests passed in from Web browsers – again, the Web server has the main operation.
There are historical and technical reasons why reuse has taken a long time to emerge. From a historical point of view, the software industry was initially preoccupied with the problem of how to program computers at all (starting with machine code), then with how to program them more efﬁciently and then with how to develop large systems in a reliable, systematic way. The potential of reusing code in different contexts became apparent as more and more systems were constructed – millions upon millions of lines of code being written every year over many decades.
Object-Oriented Analysis & Design UnderstandingSystemDevelopment with UML 2 by Mike O'Docherty