【正文】 at some of the best skills facts old road program modeled on the one of the pioneers. His research area is the architecture, not the software. In his new book, A Pattern Language : Towns, Buildings, Construction book, Alexander the construction of housing and urban building the successful model. Alexander39。s works have farreaching effects, it also affects software fields. This Department has been able to make an impact in other areas, partly because the author has a unique purpose of the observation. You might think that the construction approach is aimed at building design. But Alexander made clear, Application architecture model, which aims to serve the future to those living in these buildings or living in these cities people, make them feel fortable and happy. Alexander39。s work showed that the model is a certain access and the exchange of technical knowledge in the field excellent way. He also pointed out that a reasonable understanding of a particular record and the object of the exercise is very crucial, this requires philosophical thinking, also faced with unpredictable challenges. Software development groups have to have a model resonates, and published a large number of books to record the software development model. These books record the software process the best time, senior architecture and software design category level, and and the pattern books are still published. If you need to choose the mode of translation of the books, You should first take some time to read those to the secretary of the published ments, and then from the translation of choice for your help greatest books, and as your 2020. Abstract, a kind of interface is the kind of certain methods and fields consisting of a pool. Other examples of the object can be set right through this class for a visit. Excuse the expression usually implementation of the method of operation for the functional responsibility, which often means using the name, code Notes and other documents for descriptive. Category 1 refers to the realization of the type of method to achieve code. C language to improve the interface concept, so that it can be a separate structure, thereby interface (namely : an object must do what) and the realization (that is : a target how to meet their functional responsibilities) to effectively separate areas. C language interface to allow for more than one category with a functional, and the C interface can achieve more than one type interface. There are several design patterns can be used for the C features. For example : we can use an interface to fit a certain type of interface, In reality, this is through the application adapter mode to meet a customer39。s needs. To discuss some language C unable to plete the work, we should understand how the C language is the work performed, Therefore, we first discuss the C language interface. If you do not use interface, then you can use the abstract class (C + + language abstract). However, the n layer (ntier) software development and definition of structure and other objects, the interface has a critical role to play. Similarly, if you do not use missioned, then you can use the interface. If a public mandate required to be registered for a callback method, then the mission could improve these mandates, and therefore C Entrusted language is a very useful content. 1． Interface and abstract category Please indicate the C language and abstract category of the three interfaces between different. In use, failed to provide a method of nonabstract category with an abstract interface is similar. However, we need to pay attention to the following points : A class can achieve any number of interfaces, but only up to an abstract category of subcategories. An abstract class can include abstract, and an interface all methods in effect are abstract. An abstract class can declare and use variables, and not an interface. An abstract category of the visit Xiuchifu can be public, internal, protected, protected internal or private, and members of the interface visit Xiuchifu in default under are public, but, in a statement Interface members, allowed to use the visit Xiuchifu (even allowed to use public visit Xiuchifu). An abstract class can be defined Constructors, and not an interface. 2． Interface with the missioning Interface with the missioning of parison : Interface with the missioning of the similarities is that they can have the desired definition of the function. We learn in the process of missioning often create some confusion and the reason was partly due to trust the word It can express meaning is nuanced different concepts. The right to mission and pare interface, we have to take a look at the C language mission is how to work. C language keyword delegate introduction of a new type of mission, This new type missioned determine what type of method can be used only example of this type of mission. Commissioned no standard type of name, but it standardized the method parameter types and return types. We consider the following statement : Public delegate object BorrowReader ( IDataReader reader)。 This statement of the Declaration of a new type of mission. Commissioned by the name of the type BorrowReader. The statement said the mission can use any type of technique is, as long as the method of receiving a IDataReader object as a method parameters, and return types of methods to object. If a certain category is the following : Pricate static object GetNames (IDataReader reader) { //…}GetNames () method parameter types and return types to meet BorrowReader missioned by the types of standardized definition, this method can be used to name the types missioned example, Examples of the statement is as follows : Is a variable b BorrowReader missioned by the types of examples. Any visit to the mission examples of code can be called Object b, then missioned example of the calling obj