definition: Define a set of algorithms that encapsulate each algorithm and allow them to be interchanged.Type: behavior class modeClass Diagram:The policy pattern is the encapsulation of the algorithm, which encapsulates a series of algorithms into corresponding classes, and these classes implement the same interface, which can be replaced by each other. In the behavior class pattern, there is a pattern is also concerned about the encapsulation of the algorithm-template method mode, the contro
Strategy Mode (Strategy pattern)
embodies the principles of two very basic object-oriented design: The concept of encapsulation change and the use of interfaces in programming, rather than the implementation of interfaces.
1, the definition of the policy model:
Defines a set of algorithms that encapsulate each algorithm and allow them to be interchangeable. The policy pattern enables these algorithms to cha
Policy patterns are well applied in TreeSet and TreeMap in the Java collection, and we can implement the comparator interface implementation CompareTo () method to define our own collation, and then through TreeSet, TreeMap constructs an instance of implementing the interface, the order in the map is our custom order. We can completely define our own rules and use them very conveniently. So, what is the strategy model?Policy pattern Definition: Define
The rule mode is similar to the provider mode I just wrote. However, the configuration is different. Below are some basic demos:
Mode definitionDefinition: "prepare a set of algorithms and encapsulate each one so that they can be exchanged. "Pattern intentThe purpose of the rule mode is to encapsulate each algorithm into an independent class with a common interface for mutual replacement. These algorithms can be replaced with each other and provide a method to select the most suitable algorithm.
Policy pattern: Defines the algorithm family, encapsulates each other, so that they can be replaced each other, this pattern makes the change of the algorithm independent of the client who uses the algorithm.
The subclass family of the parent class needs to extend the new function frequently, in order to use the parent class to add the subclass more flexibly, and to write the behavior of the parent class as an interface (interface);
Use the Set () method to reset the behavior of the interface.
From today on , intends to write a note every chapter of the study, today's 0th article hope is a good beginning, can finish. Come on.Getting Started with design patterns: Strategy mode (see what the actual requirements (scenarios) are, and adopt the appropriate strategy)
Design principle 0: No matter how good the software design, after a period of time always grow and change, otherwise the softwar
The classification of metropolitan Area Network access technology can be divided into opportunistic type, application improvement type, development defensive type, leading innovation type and following imitation type. Let's explain this kind of content in detail below. Due to the change of telecom Operation Market after telecom reorganization, there are only three telecom operators left, so different operators have different consideration to the technology s
Before we talk about the strategy mode, I will give you an example of daily life, from the capital International Airport to the XXX hotel, how to pass? 1 Hotel pick-up service, direct drive to pick up. 2) Take a taxi to the past. 3 Airport Express Rail + Subway 4 Airport bus 5 bus 6) walk past (not exhausted) and so on. Using the method, we can reach from the airport to the XXX hotel, right. So the way I list from airport to XXX Hotel is the
.
In addition, in this special holiday, we provide what additional value-added, on weekdays, you only spend 100 yuan, Valentine's Day our promotional strategy, you can only spend 80 yuan to achieve the previous purpose, and may also have a small surprise gift. Therefore, the festival in the network marketing needs to develop relevant strategies. The purpose of the delineation of the title is an effective SEO skills, many web designers ignore. It also
Article Description: How does the CEO know whether the product manager has made the decision according to the business strategy, has obtained the actual and the result?
How does the CEO know that the product manager's job is consistent with his own business strategy?
How do CEOs communicate business priorities to product managers?
How does the CEO know whether the product manager has made the dec
Original address: http://zhangbuhuai.com/2015/02/11/common picture buffering strategy
It 's written in front .
"Download Picture" is almost every mobile app to deal with the problem, for the iOS development platform, downloading pictures is not a complex thing, given a URL, and then use the URL-related library (such as afnetworking) to take out the picture, but from the user's point of view, Relative to the text information, download pictures often b
Linux Task scheduling strategy
three kinds of scheduling methods for Linux kernelSched_other time-sharing Scheduling strategy Sched_fifo Real-time scheduling strategy, first to first service SCHED_RR real-time scheduling strategy, time slice rotation
when only one of the three scheduling modes in the system
All tasks
The allocation and release of memory in Java and C # is managed automatically by virtual machines, previously I have introduced the object collection method of GC in the CLR, is based on the memory recycling strategy, in fact in Java, the JVM's object recycling strategy is also based on the idea of generational. The purpose of this is to improve the rubbish
The performance of the recycle, which avoids the
As is known to all, SEO optimization We know that there is no outside the station, the daily optimization outside the station, many times the site optimization I think we in the pursuit of strategy at the same time must not forget to implement this key factor, the method is good, the strategy is perfect, but the implementation of the ability to keep up with, our optimization thought can only be wasted, As a
Collection | strategy | introduction | static | Page Currently there are many ways to prevent collection, first of all, introduce the common methods of collection strategy and its drawbacks and collection of countermeasures:
first, the determination of an IP in a certain period of time to the site pages of the number of visits, if significantly more than the normal person browsing speed, the denial of thi
We study the SME Web site from the site's content and external links to optimize the analysis. found that the optimization of corporate web site has some problems, summed up, we come up with some optimization strategy, it is very helpful for the optimization of small and medium-sized enterprises, can provide the most professional, the most systematic optimization guide.
SEO is search engine optimization, enterprises can through the Internet marke
Policy pattern: Defines a series of algorithms that encapsulate each algorithm and allow them to be replaced by each other. This mode allows the algorithm to vary independently from the customer who uses it. The policy pattern distinguishes the object itself from the operation rules, and its function is very powerful, because the core idea of the design pattern itself is the idea of the polymorphism of object-oriented programming.
That is, we plan to travel, we can have a few strategies to cons
Explain search engine optimization strategy:
When users use search engines to query information, they are actually searching for indexed databases of Web pages that have been collated by search engines. When a user looks for a keyword, all pages containing the keyword will be used as search results and displayed in accordance with the relevant indicators, such as the relevance of the Web page and search keywords, the page is referenced (link) degree.
With the development of the Internet, webmaster team growth and more and more entrepreneurs aim to the Internet this piece of fat, the number of the site is geometric development, even if very unpopular, subdivision of the industry, you can now see the search results are fierce competition. The competition of the website is divided into the competition of content resources, the competition of service quality and the promotion competition. This article only analyzes how the small and medium-sized
We often in search of keywords often encounter some snapshots do not appear in the ranking page of the keyword, there is! I think there is a lot of people think that a site can put a site outside the keyword to do have a strong ranking will feel that this site in the optimization of the use of a stronger SEO technology, In fact, I used to have this idea, often search for a keyword when there will be an irrelevant site, will feel that the search engine has problems, or the webmaster SEO is very p
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