design strategy books

Understanding of the design patternThe pattern is not code, but a generic solution for design problems. You can apply them to specific applications, and design patterns tell us how to organize classes and objects and solve some kind of problem.The need to use design patterns requires a comprehensive understanding of en

Can iOS apps be encrypted? Is there a world of technology that you build? As an iOS app, are you feeling out of it? Let's see what iOS app encryption is:http://www.ijiami.cn/newsInfo?id=541v=2In IOS development, using the official framework, the official SDK, can be exposed to a lot of design patterns, may not be noticed, in fact, has used a lot of design patternsHere's an example:Policy mode: As to what is

1 preface on the definition of the strategy model, the composition of the model, the core idea of the model, the schema diagram, the program architecture and other basic knowledge introduction. Please refer to my other blog "(three) design mode of the PHP project application (Strategy mode: Shopping mall cashier System)": http://blog.csdn.net/clevercode/article/d

: Used to remove their own registration; Do not rely on the order in which the observers are notified: since the purpose of our design is loosely coupled, if subject makes some changes that cause the order of the notifications to change, if there is some sort of dependency on the notification order in Obsever, Then observer must also make corresponding changes to adapt to subject changes, which is not in line with the original

data = { first_name: "Tom", last_name: "Xu", Age : "Unknown", Username: "Tomxu"};Validator.config = { first_name: ' Isnonempty ', age : ' Isnumber ', username: ' Isalphanum '};Finally, the code to get the results of the validation is simple:Validator.validate (data);if (Validator.haserrors ()) { Console.log (validator.messages.join ("\ n"));}SummarizeThe strategy pattern defines a series of algorithms, conceptually, al

implementation is assumed by the client object and forwarded to the policy mode context object. This itself does not touch the client needs to choose the pressure of judgment, and the strategy model and the simple engineering model, the choice of the specific implementation of the responsibilities can also be undertaken by the context, which will minimize the client's responsibilities.Strategy.cpp: Defines the entry point of the console application.

); }, instructions: "Incoming values can only protect letters and numbers, and cannot contain special characters"};When used, we first define the set of data that needs to be validated, and then we need to define the types of rules that each data needs to validate, with the following code:var data = { first_name: "Tom", last_name: "Xu", Age : "Unknown", Username: "Tomxu"}; Validator.config = { first_name: ' Isnonempty ', age : ' Isnumber ', username: ' Isalphanum '};Finally,

C # design pattern-Strategy ), The purpose of the rule mode is to encapsulate each algorithm into an independent class with a common interface for mutual replacement. The policy mode allows the algorithm to change without affecting the client. Policy mode is the packaging of algorithms. It separates the responsibility for using algorithms from the algorithms themselves and delegates them to different object

Review the design pattern-strategy Pattern The design model has been learned before. This soft exam is both a review and an improvement. The soft test needs to use java to learn the design mode. Although the previous learning is C #, the design mode has the same idea. Let's

Policy mode:The policy pattern is the behavior pattern of an object, which is intended to encapsulate a set of algorithms. Dynamic selection of the desired algorithm and use.　　　The strategy model refers to a pattern that involves decision control in a program. The strategy mode function is very powerful, because the core idea of the design pattern itself is the m

Statement: This series of blog reference "Dahua design Model", the author Geoscience. The policy pattern defines a series of algorithms and encapsulates each one, and allows them to be replaced with each other. The policy pattern allows the algorithm to be independent of its client, that is, the algorithm that encapsulates the change. Applicable scenario: 1, multiple classes only differ in the performance behavior, you can use the

Statement: This series of blog reference "Big Talk design mode", author Geoscience.Policy Mode defines a series of algorithms, encapsulates each algorithm, and allows them to be replaced with each other. The policy pattern makes the algorithm independent of the client using it , i.e. the algorithm that encapsulates the change. Applicable scenarios:1 , multiple classes differ only in Performance Behavior different, you can use

Chapter Two: Market promotion--strategy modeThe definition of the policy pattern: The strategy pattern is a method to define a series of algorithms, conceptually, all of these algorithms do the same work, the knowledge implementation is different, he can call all the algorithms in the same way, reducing the advantages of various types of algorithm classes and the use of the coupling

, Salesmansalaryalgorithm);p aysalary (salesman2, salesmansalaryalgorithm);} private static void Paysalary (account account, Salaryalgorithm salaryalgorithm) {System.out.println ("Employee:" + Account.getusername () + ", his base salary is" +account.getbasesalary () + ", the actual salary after calculation is" +salaryalgorithm.getsalary ";}} The test results are as follows:Employee: Zhang San, his base salary is 2500, the actual salary after calculation is 2500 employees: Li Total, his basic sal

data.Strategy defines the public interface of the supported algorithm, which is used by the context to invoke the algorithm defined by the Concretestrategy.The concretestrategy implements a specific algorithm.Iii. examplesBelow we use the policy model to implement the enterprise payroll system mentioned at the beginning of this article.Define the public interface of the algorithm first Public Interface Salary { int caculator (); }Then implement the specific algorithm Public class

and polymorphism.The policy model provides perfect support for the open-closed principle, encapsulating the algorithms in separate startegy, making them easy to switch, easy to understand, and easy to extend.Algorithms in the policy model can also be reused elsewhere in the system, avoiding many repetitive copy-pasting efforts.Using composition and delegation in the policy model allows the context to have the ability to execute algorithms, which is a more portable alternative to inheritance.In

, ' isnonempty ', ' user name cannot be null ') Validator.add (registerform.pwd, ' minLength ', ' Password length must not be less than 6 bits ') Validator.add (Registerform.tel, ' ismobile ', ' phone format incorrect ') Let errormsg = Validator.start () return errormsg} Registerform.onsubmit = function () {Let errormsg = Validatafunc () if (errormsg) {alert (errormsg) return}}(iii) Scenario casesMorning return ' Good morning ', noon return ' noon ', afternoon return ' Good afternoon ', evening

:"The passed-in value can contain only letters and numbers, and cannot contain special characters" }};//data that needs to be validatedvardata ={name:"Name", Tel:1555};//Configure Validator RulesValidator.config ={name:"ISZHCN", Tel:"Istel"};//Testvalidator.validate (data);(function () { if(Validator.haserrors ()) {//Console.log (Validator.messages.join ("\ n")); if(Validator.messages.join (""). IndexOf ("name")!==-1) {Console.log ("Please enter Chinese characters"); return false; }

Objective Recently, in the book "Head First design mode", in order to enhance memory and facilitate future review, in the blog to record their own learning process. I would like to use this strategy model as a series of design patterns, and in the follow-up process to enrich their own blog content, welcome you to browse.Problem There is a game simduck, the game u

First of all, let's say a few examples, so that you have a perceptual understanding of the strategy model, for example, when playing RPG, a character can have a variety of weapons, but only use a weapon when attacking, the process of switching weapons is actually a strategic mode of application.Story case: Many kinds of ducks (living ducks, rubber ducks, model ducks, wood ducks ...) , common is can be swim,display (that is, to others), live ducks can