design patterns elements of reusable object oriented software book pdf

association between people and Student student.prototype = object.create (people.prototype); var human = new People ("Joy"); Human.sayyourself ()// var studenta = new Student ("Cindy", "Junior"); Studenta.sayyourself ()// Such code seems to solve the problem of inheritance, but it is very cumbersome, the following is my recommendation for the delegate-oriented, and object-related

background, and it successfully dissolves the "software crisis" by emphasizing the expansibility and repeatability of design and implementation. Since then, the object-oriented design of the program began in the industry, and gradually become the mainstream. The evolution from C to C + + happens at this time, naturall

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 p

Seven principles: Open and close principle, Richter substitution principle, dependency reversal principle, synthesis/aggregation multiplexing principle, Dimitri rule, interface isolation principle, single duty principle.The open and closed principle is the cornerstone of object-oriented reusable. The other six principles are instruments and tools.Details of the r

used to trust the customer's request and isolate the direct dependency between the customer and the interface? System overhead. 2. Multi-inheritance separation: it is better to implement Customer requirements through multi-inheritance through interfaces. The above five are the main object-oriented design principles. They are like the Golden laws in

-oriented programming is born in this background, and it successfully dissolves the "software crisis" by emphasizing the expansibility and repeatability of design and implementation. Since then, the object-oriented design of the program began in the industry, and gradually b

[Favor composition over inheritance] Combination 1. (object) combination is a method of reusing new functions by creating an object that combines other objects. 2. delegate the function to a combined object to obtain the new function. 3. Sometimes it is called "aggregation" or "inment", although some authors give special meanings to these terms 4. For example: A

Rule 1 : Give priority to (object) combination, rather than (class) Inheritance [Favor composition over inheritance] Combination N(Object) is a combinationCombinationTo obtain the reuse method of new functions. NDelegates a feature to a combined object to obtain the new feature. NSometimes it is also called "aggregation "(Aggregation) Or "inclusive

the very beginning, I paid special attention to the knowledge of software design. The three books I have read here happen to reflect several aspects of software design and development: Programming and Development: Design Patterns elements of

used to trust the customer's request and isolate the direct dependency between the customer and the interface? System overhead. 2. Multi-inheritance separation: it is better to implement Customer requirements through multi-inheritance through interfaces. The above five are the main object-oriented design principles. They are like the Golden laws in

Just like the location of Newton's three major laws in classical mechanics, the open-closed principle is the cornerstone of object-oriented reusable design (Object Oriented Design or OO

coupling (Low coupling)Loosely coupled as a principle of evaluation system design, the responsibility lies in: Reduce dependencies between classes and classes Change the impact of a class to other classes to minimize Higher reusability Polymorphic (polymorphism)In an inherited system, a different invocation is produced at run time using the same design-time definitionProtected changes

patterns (principles)Dry–don ' t Repeat yourselfOur first object-oriented design principle is: DRY, from the name you can see that DRY (don ' t repeat yourself) means not to write duplicate code, but to abstract it into reusable blocks of code. If you have two or more block

patterns (principles).Dry–don ' t Repeat yourselfOur first object-oriented design principle is: DRY, from the name you can see that DRY (don ' t repeat yourself) means not to write duplicate code, but to abstract it into reusable blocks of code. If you have two or more bloc

Object-oriented design principles are at the heart of oops programming, but most of the Java programmers I've seen are enthusiastic about design patterns like Singleton (singleton), Decorator (adorner), OBSERVER (Observer), Instead of focusing enough attention on learning

These days re-read the "Big Talk design mode", found that there are different sentiment, but also on the internet to find the "Agile software Development-principles, patterns and practices," a book, the preface of the book there is a paragraph I think very reasonable: "Beautiful things than ugly to create cheaper and f

In this new series of articles, you will learn how to best design and optimize the Enterprise JavaBeans component, how to reduce RMI communication and JNDI access, and how to use Enterprise applications most effectively. In each article, Brett McLaughlin, the main authority in Enterprise Java programming, will provide best practices or design patterns. Many techn

Object-oriented design is divided into two stages, namely high-rise design and low-level design High-level design The overall model of development software for the development of the system in the high-rise

object-oriented three elementsPackage (encapsulation)Inheritance (inheritance)Polymorphic (polymorphism)Object-oriented Five principlesSingle Responsibility principle (SRP)Open-Close principle (OCP)Liskov substitution principle (LSP)dependency Inversion principle (DIP)Interface Isolation principle (ISP)

various components in the program. In order to achieve this goal, the object-oriented design requires that the program be divided into blocks. The size of each block should be smaller than the management level, and then each block is hidden behind the interface, allow them to communicate with each other only through interfaces. For example, if you use an