gof design patterns book

be dependent? What is the difference between reference and dependency?This is a good question! In some cases, a class retains the reference of another class, but this class does not call the method of another class, but exposes the reference of another class for external calls.For example, if Class1 has a certain attribute Class2, you can access this attribute to obtain the instance of Class2:Class1 = new Class1 ();Class2 = class1.Class2;Although Class1 references Class2, it does not call the C

There are a lot of talented programmers in the world who can include 6 design patterns in a piece of code, or they can do the design well without a pattern. But our goal is to pursue effective design, and design patterns can prov

GoF（四人帮）那本《设计模式 可复用面向对象软件的基础》可谓是设计模式方面的经典之作，其中介绍的23种设计模式，也可谓是经典中的经典。但是，设计模式的种类绝不仅仅是这23种，除此之外还有很多巧妙可爱的设计模式值得我们学习。这些被遗忘的设计模式，也可以堪称经典之作。今天我们来一起学习被遗忘的设计模式——空对象模式（Null Object Pattern）。一起看看这个模式会带给我们怎样的惊喜？First, Pattern name Provide an object as a surrogate for the lack of an object of a given type. The Null Object provides intelligent do nothing behavior, hiding the details from its collaborators. Second, problemAny

Christopher Alexander's ideas in the field of architectural design and applied this idea to the generation of graphical user interfaces in Smalltalk. A year later, Erich Gamma began trying to rewrite this idea into software development in his PhD dissertation at the University of Zurich. At the same time, James Coplien from 1989 to 1991 was also using the same ideas for the development of C + +, and then in 1991 published his

terminology, naming of classes and methods in code):(1) When communicating with others, referring to the name of the design pattern implies its pattern;(2) using the model to observe the software system can be maintained at the design level, and will not be stuck in trivial object details;(3) Communication between teams with design

Highlights of design patterns (I) and highlights of design patterns The main document of the design pattern is "big talk Design Pattern". In the first stage, we will first look at the basic concepts of various

23 design patterns (21) java meta-mode and 23 Design Patterns Dr. Yan Hong's book "JAVA and patterns" describes the Flyweight mode as follows: In boxing, Flyweight refers to the most lightweight model, that is, "Fly magnitude" or

Illustration: Java 23 design patterns Note 1, Java 23 Design PatternsIterator pattern 1.1 Iterator Pattern The element code in the array arr is displayed in Java as follows: 1 for (int I = 0; I Many elements are saved in the array. By specifying the array subscript, we can select any element from it. In the for statement, I ++ is used to increase the I value

I have only been studying programming for two years and have not done any big applications yet. I joined the C language and made several small games such as Russian. Sophomore contacts win api and DX and understands C ++. At that time, I really felt that C ++ had nothing to do. It was just a high-level C. But later, I gradually discovered the depth of object-oriented design. Write in C ++ Program It is really difficult. Unlike C, it adds functions to

One of cainiao's design patterns is thought preparation and cainiao's Design Patterns As a cainiao, we always want to become a big bull one day. In fact, we have this idea. This shows that we are a group of progressive children. First of all, I used the most common method in the previous column. It was the code wri

Introduction to Design Patterns Each pattern describes a problem that recurs around us, and the core of the solution to the problem.--Christopher Alexander The design pattern describes a general solution to some common problems in the software design process. The object-oriented