design patterns elements of reusable object oriented software

Legend has it that object-oriented development patterns were first created by lazy programmers. Development so far, people from the initial hot loyalty to discuss whether a certain language is enough object-oriented to now start a broader focus on

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

Ask for PHP object-oriented design and data access design. for example, if one class Person has a database operation class ConnPerson, one operation is to buy a chicken, how should we design chicken information in the database? Whether to include the Conn class in perison, i

Ask for PHP object-oriented design and data access design. for example, if one class Person has a database operation class ConnPerson, one operation is to buy a chicken, how should we design chicken information in the database? Whether to include the Conn class in perison, i

attribute Name: type [= default value] Visibility method Name (parameter list) [: Return value type] Examples are as follows: (3) The relationship between classes ① Association Relationship 1) bidirectional correlation. Examples are as follows: 2) One-way association. Examples are as follows: 3) Self-correlating. Examples are as follows: 4) Multiple sexual associations. Examples are as follows: 5) Aggregation relationship. Examples are as follows: 6) combined relationship. Simi

tree-like Java object to a database, and vice versa. The core of this work is how to accomplish this work with minimal performance loss. The EJB framework provides such an object persistence mechanism. We will discuss this mechanism in this article, but first of all we have a comprehensive understanding of the EJB architecture. Enterprise-Class JavaBeans (EJB) EJB technology can be defined as this: it is a

　　Why Study Design Patterns:1, more in-depth understanding of object-oriented thinking2, is conducive to the development of a strong extension of things　　What is a design pattern: a typical solution for a typical scenario that often occurs is the

need to implement personality, the specific object will be called.Encapsulation of ClassesThe responsibilities of low-level modules should not be done by high-layer modules, or the encapsulation of classes will be broken.The specifics of the encapsulation of classes in a program are:1. Duplicate the object that defines the class.2. Cross-use of various kinds of objects, the correct usage is that after one

principle. loops are not allowed in the package dependency graph.◆ SDP, stable dependency principle, and dependency in a stable direction.◆ SAP: the principle of stable abstraction should be consistent with the degree of abstraction of the package.: 1. OOD, full name: Object Oriented Design, that is, object-

Sharing (six principles of object-oriented design model) and six design models I recently read an article titled "Please call me your first brother" on the six principles of the design mode. It is simple, easy to understand and can't help but repost and share it with me !!

package, it will affect all classes in the package, but it will not affect other packages. Package coupling principle No-ring dependency principle (Acyclic Dependencies Principle, ADP) The package dependency does not allow loops. Stable-Dependencies Principle, SDP) Dependency in a stable direction Stable-abstractions principle (SAP) The abstraction level of the package should be consistent with its stability. Old ti

Labels: OCP Java design mode Object-Oriented Design1. Single Responsibility Principle The core idea of a single responsibility principle is: every object in the system should have only one independent responsibility, and all objects are concerned with the completion of their own responsibilities. SRP single Responsibil

Before we learn the seven principles of object-oriented design, we should have a good understanding of basic encapsulation, inheritance and polymorphism, as well as the ability to encode abstract classes and interfaces, because design patterns are the integrated application

computing problems. But the method of gradual refinement cannot provide a system strategy or method to solve a specific problem. Sometimes, there is no top-down method for some problems. Structured program analysis is an effective method for small-scale programs, but it is often ineffective to promote it to large-scale system development, developers cannot use this method to easily reuse reusable components of previous programs. The abstract mechanis

subclasses.Appearance mode: Provides a consistent interface for a set of interfaces in a subsystem. The appearance mode defines a high-level interface, which makes the system easier to use.Enjoy meta-mode: effectively supports a large number of fine-grained objects for the execution of shared technologies.Proxy mode: Provides a proxy for other objects to control access to this object.All right, all the doors are on the stage and the war is on. We wait and see:The first thing to do is adapter mo

1. Why to use C languageUntil today, although the C language is not the most used language, but C is not old, in many core system code, still running is beautifully designed C, the vast majority of embedded development core library software is developed by C, most of the standard algorithm is based on the standard C design. C language with its concise, flexible and superior performance, still in the heart of the core software designers have an unshaka

dependent on abstraction, and often the customer has a service interface.In fact, the inversion of this dependency is exactly where the object-oriented design marks. It doesn't matter what language you use to write your program. If the dependencies of a program are inverted, it is an object-

Object-Oriented design principles:Is the core of programming for Oops (object-oriented programming System, Object-oriented program design sy

Today, I got the book "JavaScript design Mode" written by Zhang Jongming, and began a deeper study of JavaScript.See the beginning of the book, although before reading, some good video of the explanation, to JavaScript has a basic understanding, but, in the content of the book, I still have a feeling of their own poor 108,000, the previous code is not written, using global variables, global functions, is just a process-