zfs meaning

One: The meaning of the signature:With so many people developing Android, it's entirely possible that we all put the class name, the package name, in the same name, how do you differentiate it? Signature is a distinguishing function.Since the developer may be confused by using the same package name to replace the installed program, the signature can guarantee a considerable name, but the signature of different packages is not replaced.APK If you use a

1. Preface.In declarative transactions, you configure a slice, a set of methods, such as Java code "Txadvice" transaction-manager="Txmanager" > "find*" read-only="true" propagation=" not_supported"/> The use of propagation, indicating how to use these methods of transactions, is used or not, of which propagation has seven configurations, REQUIRED, SUPPORTS, MANDATORY, Requires_new, Not_ Supported, never, NESTED. The default is required.2. The

This code is common to everyone:But what is the meaning of void (0) here?The void in JavaScript is an operator，This operator specifies that an expression is to be evaluated but does not return a value。The void operator uses the following format:1. javascript:void (expression)2. Javascript:void expressionExpression is a standard of Javascript to evaluate. Parentheses on the outside of the expression are optional, but writing is a good habit. (Implement

What is the meaning of the existence of pure virtual function? I believe that if there is a C + + course in the university, when it comes to pure virtual function, it will be said that pure virtual function is the basis of interface-oriented programming.Now and you share the pure virtual function design of the original, the purpose, the effect of production.Modern software engineering is very large, so there are a variety of technologies to solve the

HTTP Status Code meaning 1XX** Continue: Informs the client that the operation can continue　　* 101 Switching protocols: When a client needs to make a communication protocol switch, the server-side response is used in conjunction with the upgrade header　　 2XX*** Ok: The server correctly responds to the request and returns the status code if it does not match the other 2XX status code 　 *** 201 Created: Client request to create a new resource succeede

For example, if you are familiar with the header information of a webpage, it indicates the meaning lt ;! DOCTYPEHTMLPUBLIC quot;-W3CDTDHTML4.01TransitionalEN quot; www. w3.orgTRhtml4loose. dtd quot; gt; lt ;! -- Document Type -- gt; lt; html gt; lt; head gt; lt; metahttp-equiv quot; Content-Type quot; for example, familiar with the meaning of the header information of a webpage Http://www.w3.

In a. NET program/web site, if you want to generate statistical charts/graphs, you can previously use OWC (Office Web components), such as the OfficeXP component OWC10, Office2003 component OWC11. OWC uses the Com-dll method of the calling interface, but the main drawback is that the resulting picture is not beautiful enough "modern".Now, with the release of. NET 3.5, it has introduced a new MSChart component, which, of course, has been thorough. Net of the.First, to use this new graphics compon

HTTP error code meaning:"Continue":"101": Witching Protocols"$": OK"201": Created"202": Accepted"203": non-authoritative information"204": No Content"205": Reset Content"206": Partial Content"Multiple": Choices"301": Moved Permanently"302": Found"303": See other"304": Not Modified"305": Use Proxy"307": Temporary Redirect"$": Bad Request"401": Unauthorized"402": Payment Required"403": Forbidden"404": Not Found"405": Method not allowed"406": not accepta

Original blog, reproduced please indicate the source.Blog.csdn.net/hello_hwcThe meaning of this keyword: If a function uses this keyword, then when the function is called, it checks or uses the return value, and a compiler warns.Use case: When the function is encapsulated (or the SDK is written), if the use of the return value is more important, then use this keyword to remind the compiler to check whether the return value is being exploited.Example:-

@, @ Android: type, @ *, and ,@*,? , @ + Meaning and Difference I. @ indicates referencing Resources 1. Reference custom resources. Format: @ [Package:] type/Name Android: text = "@ string/hello" 2. reference system resources. Format: @ Android: type/Name Android: textcolor = "@ Android: color/opaque_red" Note: In fact@ Android: type/name is a subclass of @ [Package:] type/Name 2. @ * indicates that the system's non-public resources are referenced. F

LinuxThere are many releases and many distinctive names. Some are interesting, some are romantic, some have profound insights, some are cute, some are too short to satisfy the great ambitions of creators ..... 35 most popular Linux (BSD) are listed here)Meaning of the release name: 1.UbuntuIt means that every geek should know that this is an ancient African word that represents "human nature" or "My existence is because of the existence of everyone "

I am so ashamed to learn "digital signal processing" for a long time. I also remembered the Fourier transformation formula and made the FFT program, but I don't know what the significance of Fourier transformation is! That's it !! Fortunately, I understand it. Aside from the mathematical meaning, let alone some practical meanings. Fourier transform is used to convert signals from the time domain to the frequency domain. In this way, the characteristic

When I first came into contact with reverse proxy, I did not understand the meaning of the word. I asked a few people, but I did not know what it meant. For more information, see. The term "reverse proxy" should be relative to the word "proxy". The role of proxy is needless to say, The most common scenario is that users in some LAN browsing the Web page will set up a proxy server in the browser to access the Internet through the proxy. Reverse pro

When I was just getting started with Eclipse, I often see some strange comments in the official example, for example: shell. settext (messages. getstring ("testref. Hello"); // $ NON-NLS-1 $What exactly does this $ NON-NLS-1 $ represent? This problem was ignored after a while. Today, when reading rich client tutorial part 2, I accidentally discovered the true meaning of this line of comment ......^_^ Is an unexpected result. This is actually a method

Meaning of value types and reference types, stacks and heapsThis article mainly discusses the meaning of stacks and heaps, that is, the two types of C # categories : value types and reference types;Although we are mostly reference types in the Framework class library in. NET, our programmers use most of the value types.Reference types such as: String,object,class are always allocated from the managed heap,

Old growth talk about what's the use of interfacesThe meaning of the interface existence:1. When multiple implementation classes have the same method, using an interface reduces the amount of code2. In the future need to add a method, directly in the interface to write, inherit the interface implementation class will tell you to add a method.3. The interface is equivalent to a specification,(a) When personal development, you write the interface, your

Lt ;? Phpechoget_settings ('Home ');? Gt; meaning (because I am purely php blind, I want to learn something about wordpress website building, therefore, I want to record some questions that I encountered during my learning but failed to quickly find answers on the Internet. Meaning (Because I am blind in php and want to learn the knowledge of wordpress website construction, I have recorded some questions

In the smarty template file tpl, what is the meaning of "| h" after the variable name when writing and outputting? for example: lt; p nbsp; class = "top" gt; lt; input nbsp; type = "text" nbsp; disabled = "disabled" nbsp; name = "state" nbsp; in the value smarty template file tpl, what is the meaning of "| h" after the variable name when writing and outputting? For example: "Class =" box60 "st

The differences between VC6X86 and VC9X86 in PHP and the meaning of NonThreadSafe PHP are now available in version 5.3.0, but there are several different versions available for download. That is, VC6X86 and VC9X86. First, let me answer: What is VC6? VC6 is the difference between VC6 X86 and VC9 X86 in legacyVisualSt PHP and the meaning of Non Thread Safe. PHP version 5.3.0 is now available, but there are

Deep Exploration of the meaning of extern "C" in C ++ 1. Introduction C ++ was originally created as "a better C", but this does not mean that C ++ has global variables similar to C. And functions are compiled and linked in the same way as C. As a language compatible with C, C ++ retains A part of Procedural language features, so it can define global variables and functions that do not belong to any class. However, after all, C ++ It is an object-orie