object oriented design and patterns 2nd edition

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-

representation of the same change implies that it is a specific subclass in the same inheritance hierarchy.② package different changes into different interfaces or abstract classes, there should not be two different changes appearing on the same interface or abstract class. A change mixed with another change would violate the principle of singleness and therefore should be separated.6.4 Best Practices(1) Summary of several design principles (6 Princi

("BWM runing...\n");}};//Driver Interfaceclassidriver{ Public: //the driver should be driving the car . Virtual voidDrive (icar car) =0;//Dependency Interface};//Driver ClassclassDriver: Publicidriver{ Public: voidDrive (icar car)//implementing Interfaces{car.run (); }};intMain () {Driver Zhangsan; Benz Benz; BWM BWM; //Zhang San drive Mercedes Benzzhangsan.drive (Benz); //Zhang San Drive BMWzhangsan.drive (BWM); return 0;}3.3 3 ways to rely (see Chapter 1th)(1) Constructor p

base classDo not let classes derive from specific classesA variable cannot hold a reference to a specific class6: Abstract Factory Method mode provides an interface for creating a family of related or dependent objects without having to specify a specific class.The factory method pattern uses inheritance: Delegate the creation of objects to subclasses, subclasses implement factory methods to create objects, and abstract factory method patterns use a

"/"; return NewChu ($a,$b); Break; Case"%"; return NewQuyu ($a,$b); Break; } } } $j= Gongchang::d uixiang (3,2, "%");//Test Echo $j->js ();//OutputOutput resultsSecond, the design of six major principles1. The open-close principle is that the design should have good support for the extension, and the modification should be strictly limited.2. On the Richter scale also, the subclass mu

constructor, and by initializing the prototype in the constructor (only if necessary), while preserving the advantages of using both constructors and prototypes. In other words, you can determine whether a prototype needs to be initialized by checking that a method that should exist is valid.Parasitic constructor modeIf the above methods are not applicable, parasitic patterns can be applied. The core idea of this pattern is to create a function that

The solution is the organizational relationship between classes and mutual objects, including their roles, responsibilities, and collaboration methods. "Good Object-Oriented Design Patterns" are those that can meet "respond to changes and improve reuse" The object-

Object-oriented design patterns and principles 01. Introduction to Design Patterns:650) this.width=650; "title=" QQ picture 20150427231535.png "Src=" http://s3.51cto.com/wyfs02/M01/6C/0A/ Wkiol1u-wnmtuinbaacmezbs9jc247.jpg "alt="