factory design pattern

Design Pattern series factory patternDesign patterns have always been the most important field in object-oriented software design, and there are countless topics around them. Among them, 23 design patterns represented by GOF are even more classic. In this series, I will expl

Java Design Pattern cainiao series (4) Factory method pattern modeling and implementation Factory Method) Factory method: As the name implies, it is to call methods in the factory to p

specific subclass to instantiate. The meaning here is: Suppose we want to use Class B in Class A, and Class B is an abstract parent class. In Class A, we do not know the subclass of Class B to be instantiated, but we can know it in the subclass D of Class. In a, we cannot directly use a statement similar to new ××× because we do not know what it is. The core factory category is no longer responsible for the creation of all products. Instead, it subm

Although simple Factory mode enables the separation of object creation and use, only one object can be created at a time. It does not implement the need to create a series of interdependent objects at once, so we need to learn the abstract factory pattern. Abstract Factory: The main function is to produce abstract p

staticpublicclass HumanFactory{ //这里是 publicstaticcreateHuman(Classnull; try{ human = (Human)Class.forName(c.getName()).newInstance(); }catch(Exception e){ System.out.println("人类生产错误"); e.printStackTrace(); } return (T)human;}}2. Upgrade to multiple factory classesWhen we are working on a more complex project, we often encounter an effort to initialize an object, and all product class

This article is your own study notes, welcome reprint, but please specify the source:http://blog.csdn.net/jesson20121020 One problem with the simple factory pattern in the previous section is that class creation relies on the factory class, that is, if you want to expand the program, you must modify the factory class,

pattern.Concreteproduct (Specific product role): This role implements the interface defined by the abstract product role. A specific product has a specific factory-created, often one by one correspondence between them.The difference between a factory method pattern and a simple factory model:Simple

Original article: http://www.cnblogs.com/zhenyulu/articles/36462.html The factory mode is dedicated to instantiating a large number of classes with common interfaces. The factory mode dynamically determines which class to instantiate without having to know which class to instantiate each time in advance. The factory model has the following forms: Simple

Design Pattern-abstract factory pattern (AbstactFactory)Abstract Factory Model The abstract factory model is actually implemented through the factory model. It can also be said to be an

I recently read some knowledge about design patterns and plan to record the learning process to further deepen my understanding. In terms of the design pattern type, the simple factory pattern belongs to the creation pattern, al

Design Pattern-simple factory patternDr. Yan Hong's book "JAVA and patterns" describes the simple factory model as follows:The simple Factory mode is the class creation mode, also called the Static Factory Method mode. The simple

Design Pattern-Factory pattern)Factory Model Let's take a look at this situation: Suppose we are doing a large multiplayer online game with hundreds of monsters in it. At this time, we can easily think of using polymorphism to implement the monster category. Abstract The com

JAVA design pattern-simple factory pattern We all know that factories are used to produce products. In programming languages, the so-called factories create instantiated objects for us. The factory mode is dedicated to instantiating a large number of classes with common inte

The design (next page) derived class creates an instance of the selection base class (seeding) to invoke these methods. We now establish these two specific selection subclasses: The Straightseeding class Circleseeding class. The Prelimevent class returns an instance of the Circleseeding class, and the Timedfinalevent class returns an instance of the Straightseeding class. The structure is as follows: Through the entire event hierarchy, you can

;namespace pattern.abstractfactory{// 　　SqlmessagefactoryUsing system;using system.collections.generic;using system.text;namespace pattern.abstractfactory{// 　　XmlmessagefactoryUsing system;using system.collections.generic;using system.text;namespace pattern.abstractfactory{// 　　MessageUsing system;using system.collections.generic;using system.text;namespace pattern.abstractfactory{//　　ClientUsing system;using system.data;using system.configuration;using system.collections;using System.

between objects. The factory mode is a design pattern that helps eliminate inter-class dependencies. It uses a method to determine which class to instantiate. This article introduces the theory of the simple factory model in detail, and illustrates the specific application of the simple

Examples of simple factory patterns in PHP design pattern programming, examples explaining design patterns The Simple Factory mode is the creation mode of the class, also called the Static Factory method (

Factory pattern, the Factory mode, is the scene used to create the object, which belongs to the design pattern for creating the class.Here is a factory model case. Shape interfaces, Circle, Square, and Rectangle are implemented as

The factory methods (Factory method) mode, also known as the virtual Constructor mode or the Polymorphic factory (polymorphic Factory) mode, belongs to the class's creation pattern. In the factory method

. Obviously, this is not appropriate: You can easily change the database connection parameters, but you cannot add or change the order of these parameters unless you change all the connection code. You cannot easily instantiate a new class to connect to another database, for example, PostgresqlConnection. In this way, it is difficult to test and verify the status of the connected object separately. Using the factory