gof design patterns book

Before looking at head first design mode, a C + + version is implemented according to the code in the book (Java version in the book), and the code is uploaded in https://github.com/clpsz/ Book-hfdp-code. At the time, because of limited capacity, there was no direct choice to see Gof's

manyPeople's experience sums up some important and repeated patterns in the design and gives a system name,Give explanations and comments. The work was first done by four software masters who wrote a book together --Design Pattern: Elements of reusable object-oriented software.They are called

Design Patterns-factory method patternsDr. Yan Hong's book "JAVA and patterns" describes the factory method patterns in this way:　　The Factory method mode is the class creation mode, also known as the Virtual Constructor mode or the Polymorphic Factory mode.The purpose of th

I. Overview of the pattern The Strategy mode (strategy pattern) is similar in shape to the state mode, but somewhat different in intent. The intention is to make these algorithms interchangeable and provide a way to select the most appropriate algorithm. In my application of OOP design process Evolution (iii) This article applies to the Strategy model, in the book's rent calculation on a variety of situations, each type of

Design Patterns-understanding of appearance patterns Appearance mode: provides a consistent interface for a group of interfaces in the subsystem. This mode defines a high-level interface, making the subsystem easier to use. In the data room charging system, the appearance mode is used to remove the coupling between the U layer and the B layer. According to the pr

What is design mode Gang of Four (GOF)?In 1994, four authors:Erich Gamma,Richard Helm,Ralph Johnson and John vlissides published a book entitled Design Patterns- Reusable object-oriented software elements, a book that pioneered th

(class or object combination). Effect (Consequences) It describes the effect of pattern application and the problem that the usage pattern should weigh. Although we do not always refer to pattern effects when we describe design decisions, they are important for evaluating the costs and benefits of design selection and understanding usage patterns.

, the composition of objects and the dependency between objects become the focus of developers, because how to design the structure, inheritance, and dependency of objects will affect the maintainability of subsequent programs, code robustness, coupling, and so on. The design of the object structure can easily reflect the level of the designer. Here there are seven specific structural

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

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The design pattern is a set of ideas. However, I am a person engaged in coding. Sometimes I often think that we should consider how to implement the Code with application functions more skillfully. With the help of my masters and colleagues, I have done some work over the past few years. NET project, I love the C # language, so I found that C # has many special features when implementing some design