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distinguish: compile-time and run-time.ID obj = someinstance;if ([obj Iskindofclass:someclass]) {SomeClass *classspecifiedinstance = (SomeClass *) obj;}(2) Dynamic bindingDynamic binding is seemingly more difficult to remember, but in fact it is very simple, just remember the keyword @selector/sel. First look at "functions", for some other static language, such as C + +, generally at the time of compiling
What is dependency and what is abstraction 1. About dependency and coupling: from a small country to a harmonious society In Lao Tzu's "little country and few people" theory, I proposed an ideal social state: neighboring countries look at each other, and the people are dead and busy. This
^ 9 = 1,000,000,000 billionRound (t) = 10 ^ 12 = 1,000,000,000,000 trillion* In the metric system, the "K" or "kilo" prefix only uses lowercase letters. In the computer/communication industry, data transmission speeds are also calculated using the amount of metric data transferred per second. 1 bit (B) = 0 or 1 = one binary digit a binary element1 kilobit (Kb) = 10 ^ 3 bits = 1,000 bits one thousand bits1 megabit (MB) = 10 ^ 6 bits = 1,000,000 bits 1 million bits1 gigabit (GB) = 10 ^ 9 bits
Dojo what can be done?? 1 , making it easier for developers to add dynamic capabilities to Web pages, or to use Dojo in other JavaScript-enabled environments;2 , using the components provided by Dojo, developers can improve the usability and interactivity of WEB applications;3 , Dojo largely masks differences between browsers, so developers don't have to worry about whether Web pages are available in certain browsers;4 , you can also write a command-l
Ref: 52527270 POJO (Plain ordinary Java object) Simple Java objects, actually is the ordinary JavaBeans, is to avoid and EJB confusion created by the abbreviation.The Pojo name is used to avoid confusion with EJBS, and the abbreviation is more straightforward. There are classes of properties and their getter s
_functionname. The __cdecl is the default function call method for C + + languages. 3) __fastcall. To increase the call speed, the first two (or several) parameters are passed by the register, and the remaining parameters are passed through the stack.Quick call, contract content:A. Parameters are pressed from right to
Recently saw spring dynamic agent, grilled to the depths to see when proxy.newproxyinstance (ClassLoader, proxiedinterfaces, this); see this sentence, suddenly more confused force, Still didn't understand the invocation of the Invoke method, and then searched for a moment, and met a great God articleSpecial to record, hey: First here is the original linkIn fact, the front can be omitted (too late, to sleep), what
What is the role of zookeeper,zookeeper and how does it collaborate with Namenode and Hmaster? In the absence of contact with zookeeper students, may have these questions. Here's a summary for you.first, what is zookeeperZooKeeper, the zoo administrator, is the administrator
level.Intelligence quotient distribution of the ④ crowd.In the modern typical intelligence test, set the average IQ of the main population is 100, then according to a certain statistical principle, half of the population IQ, between 90-110, among them IQ in 90-100 and 100-110 of the people accounted for 25%. IQ accounted for 14 of the 110-120. 5%, the IQ in 120-130 of the people accounted for 7%, 130-140 of the people accounted for 3%, the remaining
you of it.Other non-Microsoft browsers, such as Firefox, are experiencing cross-domain access, and the solution unification is denial of access.A few possible scenarios:1, the way of Web Proxy. That is, when a user accesses a site, cross-domain access requests to the B site are submitted to the specified page of site A, which is used instead of the user page to
(Ob1 is OB2) equivalent to (ID (ob1) = = ID (ob2)) First the ID function can get the memory address of the object, if the memory address of the two objects is the same, then the two objects must be an object. is equivalent to IS. Python source code is proof. Static Pyobject
What is Flex? What is the relationship between flex and flash? Flex is the Presentation Server (Presentation Service) released by Macromedia. It is a Java Web iner or. for an application of Net Server, the. mxmlfile (pure XML f
XMLHttpRequest. open (); what is the difference between the first parameter post and get? When to select and what is the difference between other parameters? Get and post are two methods for sending requests from clients in HTML to the server. They can also be called two methods for transmitting data between pages,
Recently in the resolution of the problem had to use the thread, so as to contact the STA and MTA, degrees Niang interpretation mostly vague. Read more clearly on Wikipedia, taking advantage of the easy-to-access gap between sharing and self-improvement. Apartment Type Description single-threaded Apartment (STA), (threadingmodel=Apartment) A Single thread was dedicated to execute the methods of the object. In such a arrangement, method calls from threads out
this action agent actually calls the action to process the request of the method will go through the Interceptor 1,2,3, before the actual call action method, the action method ends will return a view, The view will also refer to the actionmapping and refer to the template (Jsp,freemarker), at which point the interceptor will intercept again (stating that the STRUTS2 interceptor will intercept when entering the action and returning the result, which
What is resolution? The so-called "resolution" refers to the number of pixels in the unit length or retrieved. Resolution is the same as that of pixels. The most common one is the image resolution. The maximum resolution of a digital camera output photo is the image resolut
With the development of the network, VoIP services and unified communication platforms become more and more important. The SIP protocol is an exciting focus. Some may ask, what is the SIP protocol? What's better about it? Here we will go into more details. The Chinese meaning of the SIP protocol is the process initiali
What should I do if I want to call the image in wp from the main website? Php website, now the main site uses a database aa, one of which is wordpress, and the wp database is bb. now I want to call the data in the wp database on the main site, how should I perform cross-data
Not long ago, a friend called to help: he had just used the Win7 system, but encountered a strange problem, the usual way to double-click to open the "computer" (My Computer), pop-up "system call failed" prompts, this is how it? What is the call failure? Let him confused. In
DefinedUsually we call dynamic language, static language refers to dynamic type language (dynamically Typed Language) and static type language statically Typed Language).There is also a dynamic programming Language (Dynamics programming language), a static programming language.Dynamic type language: The language that examines the type of data during run time. Programming in such a language does not give the
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