head first object oriented analysis and design

, determine the specific subclass when the program runs. ExtendedThe principle of substitution of the Richter scale is named after Professor Barbara Liskov (Barbara Liskov). Barbara Liskov: American computer scientist, 2008 Turing Award winner, 2004 John Von Neumann Award winner, American Academy of Engineering Academician, American Institute of Arts and Sciences, American Computer Association, MIT professor of Electrical and computer science, an

mechanism to implement the multi-threaded Singleton ModeClass Singleton3 { Public static readonly Singleton3 Instance = new Singleton3 (); Private Singleton3 (){}}Class Singleton3_1{Public static readonly Singleton3_1 Instance = new Singleton3_1 (); Private Singleton3_1 (){} Static Singleton3_1 (){Instance = new singleton3_1 ();}} Singleton mode ExtensionExtend an instance to N instances, such as the implementation of the Object pool.Transfers the c

modification of the situation to expand the system function To meet the requirements of open and closed principle. The dependency inversion principle is one of the basic principles behind the technologies and frameworks of COM, CORBA, EJB, and spring.4. Combination/Aggregation multiplexing principleThe combination/aggregation multiplexing principle, also known as the synthetic multiplexing principle, is to use some existing objects in a new object by

===================================== Another versionWhat are design principles? Design principles are basic tools. applying these rules can make your code more flexible, easier to maintain, and easier to expand.Basic Principles Encapsulation change Encapsulate what varies. It is intended for interface programming rather than implementing Code to an interface rather than to an implementation. Combinat

. The Notice package contains all command objects that process cache update notifications. The factory package contains the c‑factory class, this class generates the corresponding subclass object of the ccommand Class Based on the message header. The program code in the main package uses the ccommand class and the ccommandfactory class, so it inherits the creadcommand class according to the internal command package and internal factory; the class in

I entered school in September and graduated in July. It ended my pleasant and rich college life at the Software Institute. This series is a review of the four-year study of professional courses, see: http://blog.csdn.net/xiaowei_cqu/article/details/7747205 Object-Oriented Programming This is the first lesson in programming. I was also the first time in this course to get started with programming languages a

. During program design, we should always consider the best class design as much as possible, and do not modify it if it is well written. If there is a new demand, we add some classes to meet new requirements, and the original code will not move. It is absolutely impossible to disable the modification. No matter how closed the module is, there will be some changes that cannot be closed to it. Since it canno

This paper analyzes the Object-oriented programming method of PHP. Share to everyone for your reference, specific as follows: During the development of super large projects, if the use of process-oriented development, the amount of code is very large, which will use a lot of judgment and loop nesting, and many very similar code, not only to make the project code

Chapter I. INTRODUCTION1. What is design mode?Design patterns are the core solutions that people use to solve similar problems and solve such problems. Design patterns are used to implement design reuse.2. Four elements of design patternName: Describes the problem, solution,

Copy the codeCode is as follows: /* PHP Object-Oriented Program Design * * PHP5 * * And an array of objects: all belong to the PHP compound type (a variable can store multiple Unit) * * Object than an array of more powerful, not only can store more data, can also be a function of

it is not possible to be completely closed, the designer must make a choice about what kind of change the module he designed should be closed. He had to guess the type of change most likely to occur, and then construct abstractions to isolate those changes.Wait until the change takes place and take action immediately. When we first write the code, we assume that the change does not occur. When changes occur, we create abstractions to isolate the same kind of changes that occur later.In the fac

the department;Find employees in the department based on the telephone;2 departments that define complex structuresDefines the Department class as an object-oriented method.Departments require the relationship between the subordinate departments, such as: the root Department for the head office, two departments for the Shijiazhuang branch, three departments for

further analysis of the system, it was found that the process of sending mail was the same for both ordinary customers and VIP customers, meaning that the code in the two Send () methods was duplicated, and that new types of customers would be added to the system. To make the system more scalable, and to reduce code duplication, it is reconstructed using the Richter substitution principle. In this example, you can consider adding a new abs

clause 32: Make sure your pubilc inherits the is-a relationship of plastic mold Make sure public inheritance models "Is-a" one of the most important rules for –c++ (OOP) object-oriented programming is that public inheritance (open inheritance) means "is-a" (a) relationship. – If you make class D ("derived") Inherit class B ("Base") as public, you tell the compiler that each

Simple and modular maintenance is a feature of object-oriented programming. Objects are represented as classes with the same functions in the same namespace. We can add a class in the namespace without affecting other members of the namespace.Extensibility object-oriented programming essentially supports extensibility.

Object-oriented design is a very important part in php program development. if you want to become a senior php programmer, we must know the specific usage and maintenance of object-oriented design. simple modularization

Basic Analysis of Oracle-Based Object-Oriented Technology Basic Analysis of Oracle-Based Object-Oriented Technology The ORACLE tutorial is: Oracle-based object-

I went home yesterday. By the way, I brought back a lot of webcast and stayed in bed for an afternoon. Because there are a lot of design patterns in the Enterprise Library, I listened to Microsoft's lecturers for an afternoon. Alas! The quality of webcast is really junk. When I heard it, I found out that I suddenly couldn't think of the four principles of object-oriente