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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

Q: What is a bitmap? What is a vector graph? What does it matter? A: Almost every person who just contact graphic design will ask this question, from my experience to this road, I think even if you do not understand what

method we have introduced to use and describe more devices and objects, and there is nothing special about it. B. What is Lun? Lun ID is not equal to a device, but a number. It does not represent any physical attribute. In our actual environment, the Lun we encounter may be a disk space or a tape drive, or media chang

An architect is a team leader who needs to take control of the whole and need to discern local bottlenecks and give solutions based on specific business scenarios. The architect is not a person, he needs to build an efficient system, lead the team to Gongchenglvede, complete the project within the specified time. First, figure out what the architect

concern is: "What is design?" "This metaphysical topic, his thinking in his own words, began to use a designer's" mission "to ask himself. What a "mission"! Why did you come to this world? Why do you want to do the design? What do you want to leave for the world? When I

, the user interface. Controller: encapsulates operations on the model and controls the flow of data. In addition: The Unified Process of software (Rational Unified Process), XP (Extreme Programming) Extreme Programming, these are usually called "Process methods", is a methodology of the implementation Process of software projects, it is a method strategy propose

. Controller: encapsulates operations on the model and controls the flow of data. In addition: The Unified Process of software (Rational Unified Process), XP (eXtreme Programming) Extreme Programming, these are usually called "process methods", is a methodology of the implementation process of software projects, it is a method strategy proposed for the impleme

input and output system of skills management and settings, so that the system runs in the best state, using the BIOS setup program can be used to troubleshoot the system or diagnose system problems.Bois is a software system that is included in the system that determines the basic function of a machine before it has access to the program on the disk. So what

When you start the game, you must be reminded to reduce the draw call and, of course, unity is no exception, open the Stats in the game window and see the numbers of draw calls and batched. But what exactly is Draw call? Is the effect coming from the CPU? or GPU? Let Unityin once tell you.First, let's define

interruption. After that, the processor will notify the OS that an interruption has occurred. In this way, the OS can properly handle this interrupt.Different devices have different interruptions, and each interruption is identified by a unique number. These values are generally called the interrupt request line (IRQ ). An interrupt can be divided into synchronous interrupt and asynchronous interrupt:1. S

Uncover the real speed of ADSL Users who often use ADSL, do you know the real speed of ADSL? With this question, we will expand the problem step by step.Many users report that,The download speed of ADSL does not reach the nominal 512 K. After the computer accesses the network through ADSL, a download speed indicator is displayed during download. The download speed shown above is generally 50 Kbyte/s.Left an

. Below is a look at a small example:var request = new XMLHttpRequest ();This expression is often used when creating a Request object when using AJAX technology. Then we can see clearly "new XMLHttpRequest", "This sentence is a standard constructor !" our "var" declares a "request" Object , using the constructor "new XMLHttpRequest ();" to initialize the "reques

Insist ~ insist ~ insist ~! Sweet Tooth Like to eat sweets What should we get for dessert? What do we have for dessert? We just finished eating dinner! And you ' re already thinking about dessert!? We've just had dinner, and you've been thinking about dessert? Sorry.i have such a huge sweet tooth! I love dessert. I'm sorr

Stock entry: What is stock index and what is stock index Stock entry: What is stock index and what is stock index I. Index Definition The s

(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

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

A dbcontext constructor, method Overloading In the binary dbcontext instance, how is a table object added? Does the three branch categories undermine a single responsibility? The four-segment method defines the type operation specifications from the other hand. 5. assign values to attributes in the LINQ object class. Before and after the changes, sendpropertychanging and sendpropertychanged Six linqtosql triggers sendpropertychanging and sen

can be translated into: Ordinary Java class, with a part getter/ The class of setter methods can be called Pojo, but JavaBean is much more complex than Pojo, Java beans are reusable components, there is no strict specification for Java beans, and in theory, any Java class can be a Bean. In general, however, because Java beans are created by containers (such as T

still the MBR partition structure, but it is not suspected that GPT is the future trend. We can simply represent the MBR disk partition structure (basic disk under Windows, 4 primary partitions):MBR partition structureTo make it easier for the computer to access the hard disk, divide the space on the hard disk into chunks (called sectors, or sector), and then as

_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 left onto the stack.B. The function is called