silhouette patterns

like this, it is indeed too complicated. However, the actual problems are often not so simple and there will be many additional requirements. For example, if all objects have the initialize method, you must ensure that the initialize method is called for normal initialization during object creation, for example, we may need to add additional logic judgment when creating ConcreteObjectA, etc. Different object creation and initialization processes will follow. Based on the above implementation, w

ArticleDirectory I. general concept Ii. Classification I. general concept Behavioral patterns Chain of resp. A way of passing a request between a chain of Objects Command Encapsulate a command request as an object Interpreter A way to include language elements in a program Iterator Sequentially access the elements of a collection Mediator

combination(2) Child object (Leaf): The most basic object that makes up a grouped object(3) grouped objects (composite): Complex objects grouped by child objectsThe key to understanding the combinatorial pattern is to understand the consistency of the combined patterns on the use of individual objects and composite objects, and then we'll talk about the realization of the combinatorial pattern.Combined mode is designed for dynamically creating a UI o

Looking at "C + + Design new thinking", found in the beginning of a large length of the introduction of the Strategy Model (policy), the strategy model is not a classic design pattern, but in fact, in our day-to-day development is essential. Policy, strategy, policy, the meaning here is that the complex function of the class as far as possible to split into a single function of a simple class combination, simple class is only responsible for the simple behavior or a certain aspect of the structu

that the book rental of Life class is very small, perhaps because of the rent, very few people to rent, so the boss decided to lower rents, the life of books in accordance with the rent of the computer class charge. What about this time? Is there already existing computer books rent calculation strategy, at this time we just need to live to book rental calculation strategy for computer books rent calculation strategy will be OK. With this analysis, the policy pattern (strategy) is the pattern f

Data-driven patterns can be used when testing the same workflow for changing data. What is a workflow. Is the model of the workflow. As an example of a valid login workflow, you can establish the following model (workflow), which can be represented by a workflow flowchart: (1) Open the login page, (2) Enter the user name, enter the password, enter the verification code--(3) Submit, system to determine whether the input is correct and (4) login success

Adoption of design patterns in ANDROID-behavior patterns 1 responsibility chain model The purpose of the responsibility chain mode is to allow multiple objects to process requests, so as to avoid coupling between request senders and receivers. Connect these objects into a chain and pass the request along the chain until an object processes it. So that multiple objects have the opportunity to process the request, so as to avoid coupling between the re

There are three types of design patterns: creation, structure, and behavior. Among them, the creation type is: 1. Singleton. Singleton mode: ensure that a class has only one instance, and provide a global access point to it. 2. Abstract Factory, Abstract Factory: provides an interface for creating a series of related or mutually dependent objects without specifying their specific classes. 3. Factory Method: Define an interface used to create objects,

A learning journey based on design patterns -----Appearance Mode 1, Initial appearance Mode Stock:EachInvestors directly purchase various types of stocks (common) Fund: Investors deal with experts to allow expertsAgree to selectStock to be purchased (appearance) 2, What is appearance mode? Provides a consistent interface for a group of interfaces in the subsystem,F A C A D EMode defines a high-level interface, which makes this subsyste

A learning journey based on design patterns ----- Observer Mode 1, Initial observer Mode In a time when the network was not so developed, many people wanted to know that the weather forecast for the next day had to watch live TV at the specified time, but sometimes they wanted to watch the weather and found that live TV had passed. This is really an unpleasant thing. Based on this situation, Mobile launched the"Scheduled query weather fo

Understanding design patterns-command patternsI have learned part of the design model, but I have never studied the system. I recently bought the big talk design model from Cheng Jie and recently want to learn it systematically. When I saw the command mode, I thought it was not very easy to understand, so I searched some documents online. I found that many articles on the design pattern were somewhat different, so I wanted to write my own views on the

to the previously saved policy object: var bonus = new bonus (); Bonus.setsalary (10000); Bonus.setstrategy (new performances ()); Set Policy Object Console.log (Bonus.getbonus ());//output: 40000 bonus.setstrategy (New Performancea ());//Set Policy Object Console.log (Bonus.getbonus ()); Output: 30000 We've just reconstructed this year's year-end bonus code with a policy model, and we can see that the code becomes clearer after the policy pattern is refactored, and that the

Command mode, which is the mechanism that encapsulates a common operation. If you are familiar with C or PHP, you may have encountered the command, which is equivalent to a callback (callback) in the program. Callbacks typically use a function pointer or data structure such as a string and array implementation in PHP, which is an abstraction over a method invocation that absorbs all the object-oriented benefits: compositing, inheritance, and processing. For example, the book "Design

Design Patterns Six relationships: dependency, association, aggregation, composition, inheritance, and implementation In the object-oriented design pattern, there are mainly 6 relationships between classes and classes: Dependency, association, aggregation, composition, inheritance, implementation. Their coupling degree is enhanced in turn Differences between dependencies, associations, aggregations, and combinations • A dependency (Dependency) relatio

When learning object-oriented Design object relationships, the distinction between dependencies, associations, aggregations, and combinations of these four relationships is easy to confuse. In particular, the latter three, only in the semantic difference, the so-called semantics refers to the context of the environment, specific scenarios and so on. They are basically the same in the programming language, but basically the same doesn't mean exactly the same, which is already mentioned in my prev

Raw Material Pictures Final effect 1, open Photoshop software, drag photos into, and then copy a layer, and then ctrl+m the curve and ctrl+l tune

The results of this tutorial look very concise and very artistic. The method of making is also simpler: before making a picture, you need to find a sunrise or sunset, then pull out the main material you need, and then paste it into the background.

Differentiate what is architecture, framework, pattern, and platform, and always feel that these words are too abstract and vague, today we all say what is the architecture, framework, pattern and platform. Some of the individual definitions and distinctions collected from the Web are as follows: Design Patterns 1. Design mode Why should we say design mode first? Because design patterns are the most bas

Some of my band's friends have just experienced a small member Lineup change. They need to change the photos on their home page. I think it may be interesting to see a little interaction. There may be many ways to achieve this effect. This

Effect Chart: Material: Production Start: First the portrait is deducted, here with the channel buckle picture is the best, the figure quickly not so careful, will buckle the picture to put into the