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"];will be processed by the compiler:sel sel = Sel_get_uid ("Setvalue:forkey:"); IMP method = Objc_msg_lookup (Site->isa,sel); method (site, SEL, @ "sitename", @ "name");First, we introduce two basic concepts:(1) SEL data type: It is the environment parameter of the method that the compiler runs in Objective-c. (2) IMP data type: He's actually a function pointer to the compiler's internal implementation. When the Objective-c compiler deals with implem

Do not be intimidated by titles. It is actually very simple. Otherwise, you can only write noodle programs for a lifetime. IN particular, most ASP programmers write 3 IN 1 (Super platinum: P) programs, barely able to write hierarchical style is also a master of the master, such prawns are estimated to have long been transformed into a system analyst. Generally, systems are divided into three layers (it is said that three layers are good): user layer, logic layer, and data layer. These names may

role is used to directly create a product object. The method required by the specific builder class to implement this interface: one is the construction method, and the other is the result return method. Concrete Builder role: this role is played by classes closely related to applications that create product instances under application calls. The main tasks completed by this role include: Implements the interfaces provided by the Builder role and completes the process of creating product inst

. System.Drawing Working with graphics and drawings, including printing Syst Em. Data Deals with access and management, plays an important role in defining ADO System.IO Tube Synchronous and asynchronous access to files and streams system.windows Process form-based window creation System.Reflection Contains a clas

Turning on the power to start the machine is almost a daily task for computer enthusiasts. We will not be unfamiliar with the screen startup screen,, what does the computer do when it displays these boot screens? I believe some of my friends are not very clear. This article will introduce what computers have done when the power is turned on to the appearance of Windows blue sky and white clouds. First, let's understand some basic concepts. First, we are very familiar with BIOS (Basic Input and O

improved by 40%, and the latest 14nm process of 820, 810 20nm has considerable progress.Nokia OZO Panoramic Camera ListingNokia, the once-smart-phone giant, has begun to shift its focus to smart hardware after the mobile market hit. Remember that dome camera Ozo released at the end of July? Nokia today announced in the official Twitter that Ozo will be listed on November 30.The Ozo is a vision product for 3D VR photography, equipped with up to 8 simultaneous cameras and 8 microphones to capture

Reference: KIEKie is widely used in Drools jbpm Uberfire, following a brief introduction to several important components of KIE-APIMaven Dependency Several componentsKieservices:kie integral entry that can be used to create container,resource,filesystem etc.Kiecontainer:kiecontainer is a kiebase container that can be used to obtain specific kiesession according to the kiebase information described in Kmodule.xml.Kiebase:kiebase is a knowledge warehouse, contains a number of rules, pro

clockwise, the face is the front. Such asIn accordance with the order of the 0,1,2 three points made up of this face is the above we can see The current mainstream (Direct3D and/or OpenGL) divides the triangles into two faces (front and rear). To help you remember the"front" three-dimensional coordinates, the thumb is the direction of the z+ is facing us (and the previous illustration in the up direction), the index finger is y+ direction, and the middle finger is y+ direction. (+

points clockwise, the face is the front. Such asIn accordance with the order of the 0,1,2 three points made up of this face is the above we can see The current mainstream (Direct3D and/or OpenGL) divides the triangles into two faces (front and rear). To help you remember the"front" three-dimensional coordinates, the thumb is the direction of the z+ is facing us (and the previous illustration in the up direction), the index finger is y+ direction, and the middle finger is y+ direct

Both the left and right shifts are the concepts of bit operations. We know that computers store data based on binary, so the concept of left and right shifts is important. This article deals with a 32-bit machine. [left] discard highest bit, 0 minimum bitThe left shift is to move a number of bits to the left in accordance with the binary, with the operator int 1 2// Move the value of X to the left 2 bits1 binary number corresponding to 000 ... 0001

generation (Permanent Generation)."Run a constant poolThis area holds constants for classes and interfaces, and in addition, it holds all references to methods and fields. When a method or domain is referenced, the JVM finds the actual address of the method and domain in memory by running these references in the constant pool.(heap)The heap contains objects or instances that are created by the program. This area has a significant impact on the performance of the JVM. The garbage collection mech

Generally, the Java code we write runs in the form of a process. The written code is a "program", and the executed program is a "process ". A process is an independent unit for the system to allocate and schedule resources. A thread is located at the lower level of a process and the smallest Execution Unit in the system. But the thread itself does not have resources, and the thread itself generally only has register data and the stack during execution. Multiple threads in the same process share

In Java ),),) > Indicates greater than, for example, if (a> B)... the result is of the boolean type. > Indicates the right shift. For example, if int I = 15; I> 2 is 3, the removed part is discarded. The binary format may be better understood. The result of 0000 1111 (15) shifted to 2 places is 0000 0011 (3), 0001 1010 (18) the result of moving three places to the right is 0000 0011 (3 ). The ">>>" operator deals with unsigned displacement. It

see whether the currently parsed character is in double quotes or the character is escaped, and any character followed by the escape character or the character in double quotation marks is treated as a normal character, if this is not the case , the label for the character is found in the Tokenmap.Let's take a look at the special handling function for the escape character Handleesc, if the regular expression [\b] is parsed, the character \ and character B are interpreted together, and the funct

getter method to inject the data from the request; Struts2 actually deals with the request through the setter getter method. ; in Struts2, an Action object corresponds to a request context.3. Parameter passing: Struts is a parameter that can be accepted with attributes when it is accepted, which means that the parameters are shared by multiple methods.4. Design thinking: Struts more in line with OOP programming ideas, Spring is more cautious, extende

The cookie size is limited, and every time you request a new page, the cookie is sent in the past, which virtually wastes bandwidth, and the cookie needs to be specified.Domain and cannot be called across domains.WEB Storage has setitem,getitem,removeitem,clear and other methods, the operation is not as simple as a cookie requires the front-end developer to encapsulate Setcookie,getcookie.The role of cookies is to interact with the server as part of the HTTP specification and the Web storage onl

# @jarvisWidgetBody ()# @widgetEditBox ()#end# @widgetBody ()to the displayed on top rightCorner of the widget header. #end#end#end through the reconstruction of Smartadmin, the css,js relationship in Smartadmin is successfully cleared, which facilitates the subsequent reuse.By writing macros, you can isolate the component developer from the page developer. It is the component developer who deals with js,css and so on, and lets page developer

Mechanism The struts2 framework is a Class-level interception. Each time a request is sent, a corresponding Action in the controller is created, and the setter getter method is called to inject data in the request. Struts2 actually deals with requests through the setter getter method. In struts2, an Action object corresponds to a request context. Spring3 mvc is different. spring3mvc is a method-level interception. After the method is intercepted,

actual address of the method and domain in memory by running these references in the constant pool. Heap Heap is a program-created object or instance. This area has a significant impact on the performance of the JVM. The garbage collection mechanism deals with this area of memory. Therefore, the ClassLoader loading is actually based on the compiled class file, the Java bytecode loaded into the JVM memory, and complete the operation of the data in the

Varnish and Website PerformanceThis section focuses on how to tune varnish server and how to use varnish to optimize your Web site. There are three bars. The first section you should think of the various tools and functions of varnish, the next section how to clear the cached content from the cache. Clearing content is a basic feature because it allows you to add TTL to cached objects. The larger the TTL, the longer the varnish remains in the cache, which means that varnish processes more reques