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subclasses.Appearance mode: Provides a consistent interface for a set of interfaces in a subsystem. The appearance mode defines a high-level interface, which makes the system easier to use.Enjoy meta-mode: effectively supports a large number of fine-grained objects for the execution of shared technologies.Proxy mode: Provides a proxy for other objects to control access to this object.All right, all the doors are on the stage and the war is on. We wait and see:The first thing to do is adapter mo
1. Why to use C languageUntil today, although the C language is not the most used language, but C is not old, in many core system code, still running is beautifully designed C, the vast majority of embedded development core library software is developed by C, most of the standard algorithm is based on the standard C design. C language with its concise, flexible and superior performance, still in the heart of the core software designers have an unshaka
If the principle of open-end is object-oriented design, then the dependency reversal principle is one of the main implementation mechanisms of object-oriented design, which is the concrete implementation of system abstraction. The
dependent on abstraction, and often the customer has a service interface.In fact, the inversion of this dependency is exactly where the object-oriented design marks. It doesn't matter what language you use to write your program. If the dependencies of a program are inverted, it is an object-
combination/aggregation, rather than inheritance (because it is intuitive, the first impression is "oh, this is oo "). This is the so-called "favor composition over inheritance". In practice, combination/aggregation will bring greater benefits than inheritance, So priority should be given. 6) Law of Demeter or least knowlegde principle (low level or LKP), the Demeter principle or least knowledge principle, which was first formally applied in the Demeter system and therefore defined as the Demet
3 basic elements of object-oriented: encapsulation, inheritance, polymorphism Object-oriented 5 basic design principles: single Duty principle (Single-resposibility Principle) Its core idea is: A class, it is best to do only one t
The maintainability and reusability of softwareRobert C.martin, a well-known software guru, believes that a low-maintainability (maintainability) software design is typically caused by the following 4 reasons: Too stiff (rigidity) Too fragile (fragility) Low reuse rate (immobility) High viscosity (Viscosity) The software engineering and modeling guru Peter Coad believes that a good system
1 OO design principlesThe use of object-oriented analysis and design ideas, for us to analyze and solve problems to provide a new way of thinking. After we get the demand (omit Ooa, complete later), the next question is: How to object-or
1. IntroductionIt has been two years since I began to learn programming from a freshman year. From the initial study of the Html,js,javese, to Javaee,android, I can also write some toys. The learning process also unconsciously understood some of the so-called design Patterns , and now intends to learn the system. Learn to book the art of
. Now, we can generalize these objects into a class. (52) it should be illegal to overwrite the methods in the base class by using an empty method (that is, a method that does nothing) in the derived class. (53) do not confuse optional items with the requirements for inheritance. Model the optional include into a class that inherits and can cause flooding. (54) try to create reusable frameworks rather than reusabl
Chapter 6 inheritance and object-oriented design Many people think that inheritance is the whole of object-oriented programming. Whether this point of view is correct remains to be discussed, but the number of terms in other chapters in this
derived class. p103(53) Do not confuse the optional inclusion with the need for inheritance. Modeling an optional inclusion into a class where inheritance can lead to flooding. p108(54) When creating an inheritance hierarchy, try creating a reusable framework, rather than a reusable component. p112(55) If you use multiple inheritance in your design, let's say yo
(that is, a method that does nothing) in a derived class. (53) Do not confuse the optional inclusion with the need for inheritance. Modeling an optional inclusion into a class where inheritance can lead to flooding. (54) When creating an inheritance hierarchy, try creating a reusable framework, rather than a reusable component. (55) If you use multiple inheritance in your
Object-oriented design principlesBorn to support maintainability multiplexing, these principles are embedded in many design patterns, which are the guiding principles that are summarized in many design scenarios, and understand
61 military rules of PHP object-oriented analysis design. (1) all data should be hidden inside the class. (2) a class user must depend on the common interfaces of the class, but the class cannot depend on its users. (3) minimize the elimination in the class protocol (1) all data should be hidden inside the class. (2) a class user must depend on the common interfa
I went home yesterday. By the way, I brought back a lot of webcast and stayed in bed for an afternoon. Because there are a lot of design patterns in the Enterprise Library, I listened to Microsoft's lecturers for an afternoon. Alas! The quality of webcast is really junk. When I heard it, I found out that I suddenly couldn't think of the four principles of object-
software development efficiency, improving software quality, saving development costs, and improving system maintainability. The purpose of object-oriented design reuse is to enable maintainability reuse. In the object-oriented de
Document directory Advantages and disadvantages of Combination Inheritance Inheritance/combination Example 1 Inheritance/combination Example 2 Rule 1: Prioritize (object) combinations, rather than (class) Inheritance [Favor composition over inheritance] Combination1. (object) combination is a method of reusing new functions by creating an object that comb
Seven Principles of object-oriented design and seven Today we will talk about seven principles, namely: single responsibility, Lishi replacement, dimit law, dependency reversal, interface isolation, synthesis/aggregation principle, and openness-closure. 1. Open and Close principles(Open-Closed Principle, OCP) Definition:The software entity shall be open to extens
inheritance in the design, first assume that you have made a mistake. If you do not make a mistake, try to prove it. (56) as long as inheritance is used in object-oriented design, I have two questions: (1) is the derived class a special type of the thing it inherits? (2) is the base class part of the derived class? (5
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