dvi differences

same functionality, but 303 explicitly indicates that the client should use the Get method to obtain the resource, which differs from the 302 status code.For example, when you use the Post method to access a CGI program, its execution results in a 303 status code when you want the client to be redirected to another URI with the Get method. Although 302 can achieve the same function, it is ideal to use the 302 status code here.When the 301, 302, 303 response status codes are returned, almost all

method, but the interface must have an "abstract" method 3, there are differences in grammar 4. Abstract classes are declared with the abstract keyword before the class, and class is declared as a class, the interface is declared with interface, but cannot be declared with class, because the interface is not a class. 5. Abstract methods of abstract classes must be declared with abstract, while interfaces do not need 6. Abstract classes implement

From a common application, the requirements of the storage system has good IO performance also requires the protection of data security work, so raid10 and RAID5 should be our focus of attention. Simply talking about the advantages of different RAID levels is impractical, and raid is only a complete array with disk binding. The following from the IO performance, data refactoring and the impact on the system performance, data security, etc., combined with the status of the disk to analyze the

InnoDB and MyISAM are the two most commonly used table types used by many people when using MySQL, each with its own pros and cons, depending on the specific application. The basic difference is that the MyISAM type does not support advanced processing, such as transaction processing, but InnoDB type support. MyISAM type tables emphasize performance, which is performed more than InnoDB types faster, but does not provide transactional support, while InnoDB provides transactional support and advan

This article is mainly about the JavaScript function definition of several differences in a detailed summary of the introduction, the need for friends can come to the reference, I hope to help you. Definition of JavaScript function nbsp; 1: Invoke keyword function to construct, such as: function distance (x1,x2,y1,y2) {var dx=x2-x1; var dy=y2-y1; return Math.sqr T (Dx*dx+dy*dy); } nbsp; 2: Use function () constructor var f=new function* "x", "Y", "r

for free; then install:# TAR-XZPVF Rarlinux-3.2.0.tar.gz# CD RAR# makeThis installs well, after installation has RAR and unrar these two programs, RAR is the compression program, Unrar is the decompression program. They have a lot of parameter options, here are just a brief introduction, still examples of its use:# rar a All *.jpgThis command compresses all. jpg files into a RAR package named All.rar, which will automatically append the. rar extension to the package name.# Unrar E All.rarThis c

; then install:# TAR-XZPVF Rarlinux-3.2.0.tar.gz# CD RAR# makeThis installs well, after installation has RAR and unrar these two programs, RAR is the compression program, Unrar is the decompression program. They have a lot of parameter options, here are just a brief introduction, still examples of its use:# rar a All *.jpgThis command compresses all. jpg files into a RAR package named All.rar, which will automatically append the. rar extension to the package name.# Unrar E All.rarThis command is

assembly code, many programmers think it is too obscure, no relationship, on the Linux platform you can also use the Intel format to write assembler, suggest or stick to it, after all, under the Linux T is the mainstream language format:Example 2. Intel format ; Hello.asmsection. data; Segment DeclarationMSG db "Hello, world!", 0xA; string to outputLen Equ $-msg; string lengthsection. Text; code Snippet DeclarationGlobal _start; Specify the entry function_start:; display a string o

[] is actually shorthand for the test command in bash. That is, all [expr] equals test exprFor the test command, use-eq to make a numeric comparison, and when you pass in the string, you get an error.[[expr]] is a real conditional judgment statement in Bash whose syntax is more in line with programming habits (such as , | | ), although I think the intentional string to-eq in [[]] should also be as error as test, but it is obvious that the bash implementation directly converts a non-integer strin

advantage is that all UNIX implementations are supported, and the pipeline is completely removed after the last access pipeline's process terminates, and the flaw is that the pipeline allows only one-way transmission or between parent and child processes.System IPC: The advantages are powerful, able to communicate between unrelated processes; The flaw is that the keyword key_t uses kernel identities, consumes kernel resources, and can only be explicitly deleted, and cannot use some of the socke

1, StringThe value of the string variable cannot be changed, and if the value of the string variable is to be changed, the virtual machine first traverses the string constant in the method area, and if there is a required value, the virtual machine assigns the address of the constant value directly to the string variable, if no such value exists. The virtual machine will additionally divide a block of memory space in the method area to store string constants, and then assign the address to the s

later. Some of the essential executable files for application software tools such as C + +, g++, GCC, Chdrv, diff, Dig, Du, eject, elm, free, gnome*, gzip, htpasswd, KFM, Ktop, last, less, Locale, M4, make, man, Mcopy, NcFTP, newaliases, nslookup passwd, quota, smb*, wget, etc./usr/sbin Place Some user-installed system-managed prerequisites such as: DHCPD, HTTPD, IMAP, IN.*D, inetd, LPD, named, Netconfig, NMBD, samba, sendmail, squid, swap, TCPD, tcpdump and so on.If the newly installed system

 Python 2.7 client sends data to server demoSer = Socket.socket ()Ser.connect ((Ghost,gport))LENSTR = Len (str)Lendata = Struct.pack (' BB ', lenstr/256,lenstr%256)Ser.send (Lendata)Ser.send (str)Recvlen = SER.RECV (2)Recvlen = Struct.unpack (' BB ', Recvlen)Totallen = recvlen[0]*256 + recvlen[1]%256str = SER.RECV (Totallen)Ser.close ()Python 3.4 client sends data to server demoLenstr = '%s%s '% (Lenstr,len (str))str = "188888888222050%4s%s"% (LENSTR,STR)if TermType = = 1:Writeloginfo (6, ' [R

); } catch (Exception e) { E.printstacktrace (); } File File = new file ("D:\\dev3\\ Unified channel management \\EB. Salechannelplatform "); Deletefiles (file); } /** * * @param b */ public static void test (final int b) { Final int a = 10; At this time the main thread bar with the test method, then this method is still in the main thread, only to the next sentence new thread and start (thread inside the program is a chil

Member DifferencesAbstract class:Member variables: Can be variables, or constantsConstruction method: AvailableMember methods: can be abstract or non-abstractInterface:Member variable: can only be a constantMember methods: can only be abstractedRelationship DifferencesClasses and classes:Inheritance, single inheritanceClasses and Interfaces:Implementation, single implementation, multi-implementationInterfaces and interfaces:Inheritance, single inheritance, multiple inheritanceDifferences in desi

In addition to some of the collection classes in Java, actually implemented a number of interfaces, so there will be a variety of methods for the same operation, such as the LinkedList class.First look at the inheritance diagram for the Java Collection class:Here is a simple way to make a simple distinction between its repeated methods.Offer,add differences:Some queues have a size limit, so if you want to add a new item to a full queue, the extra items will be rejected.At this point the new offe

, the main point is to add an entry in the internal array, pointing to the element being added, which may occasionally cause the array to be redistributed, whereas for LinkedList, the overhead is uniform, allocating an internal entry object.2. Inserting or deleting an element in the middle of a ArrayList means that the remaining elements in the list will be moved, while the overhead of inserting or deleting an element in the middle of the linkedlist is fixed.3. LinkedList does not support effici

Class Methodtest ():var1 = "Class var" def__init__ (self, var2 = "Object var" ): self.var2 = var2 @staticmethod Defstaticfun ( ): print ' static method ' @classmethod Defclassfun (CLS): print ' class method ' The same points as Staticmethod and Classmethod:1. Can be called from a class or instanceMT = Methodtest ()Methodtest.staticfun ()Mt.staticfun ()Methodtest.classfun ()Mt.classfun ()2. Cannot access instance members @staticmethod Defstaticfun ( ): print

1. $watch Simple to use$watch is a scope function that listens for model changes and notifies you when the part of your model changes.$watch (watchexpression, Listener, objectequality);The description of each parameter is as follows: Watchexpression: The Listener object, which can be a angular expression such as ' name ', or function such as functions () {return $scope. Name}. Listener: The function or expression that will be called when watchexpression changes, it receives 3 parame

LinkedList, the overhead of adding an element at the end of the list is fixed. For ArrayList, the main point is to add an entry in the internal array, pointing to the element being added, which may occasionally cause the array to be redistributed, whereas for LinkedList, the overhead is uniform, allocating an internal entry object.2. Inserting or deleting an element in the middle of a ArrayList means that the remaining elements in the list will be moved, while the overhead of inserting or delet