chatbot learns

[Rookie learns Java] 4: Servlet Technology What is Servlet? Servlet is a java language class used to expand the capabilities of the server through the request response mode. Although servlets can respond to any type of response, they are generally used to expand Web-based applications. In such applications, Java servlet technology defines specific HTTP servlet classes. Generally, servlets run on multi-threaded servers. Therefore, you must understand t

: Get keyModify syntax: Set key 0 (storage time, seconds) character size This syntax is modified if key exists, and is added if it does not exist.Replace key 0 (storage time, seconds) character size if key does not exist, it will be an error.Delete Syntax: Delete keyAppend forward append prepend append appendEmpty memory Flush_all at onceView information in Memcache stats The most important thing is the get_hits hit rate, the higher the better. If this value is low, it indicates that there is a

Python learns the serialization and deserialization of day4 files, Json and pickle serialization and deserialization Json is used to implement file interaction between different programs. Because file information interaction is required between different programs, code written in python may need to be transmitted with code written in other languages, json supports interaction between all programs. json replaces XML because the XML format is slightly c

solve.for element in [1, 2, 3]:Print elementfor element in (1, 2, 3):Print elementFor key in {' One ': 1, ' One ': 2}:Print keyFor char in "123":Print CharFor line in open ("MyFile.txt"):Print LineWith iteratorsIn the background, the For statement calls ITER () in the container object. The function returns an iterator object that defines the next () method, which accesses the element one at a time in the container. When there are no subsequent elements, next () throws a Stopiteration exception

]Extension=php_apc.dllapc.rfc1867 = OnUpload_max_filesize = 100MPost_max_size = 100MApc.max_file_size = 200MUpload_max_filesize = 1000MPost_max_size = 1000MMax_execution_time = 600; each maximum time value of PHP page run ( seconds ), default Max_input_time = 600; each the maximum time the PHP page needs to receive data, by default 60Memory_limit = 128M; each maximum memory eaten by PHP page, default 8MOpcode Cachethe PHP implementation process can be shown in the following diagram:650) this.wid

to detail: When adding data, if expire (timeout) is set to 0, it means that it never expires. Expire directly to the number of seconds, the maximum can only be 30 days, that is, 30*3600*24. If you want to keep time longer than 30 days, use a timestamp, that is, time () + days *3600*24.Put resources, but 0, so the resources are not supported. NoteWhen you add an array, you can serialize Serializa () as needed to save the objects and arrays on disk.There are also JSON, which can also be converted

written to the front of the scriptIni_set ("Session.sava_handler", "Memcache"), Ini_set ("Session.save_path", "tcp://127.0.0.1:9999"); The parameters of the function are stored in the form of a value-reduction pairThe Ini_set () feature is powerful and can modify any value in the php.ini.Talking about the Safe_mode modeTheir biggest difference is that once the security mode is turned on, the operation of the files on the server is almost invalid.Ini_set () will only work in very script, not oth

operation or function is applied to an object of the correct type, but the object uses an inappropriate value to throwZerodibivionerror: The second argument of a division or modulo operation is 0 o'clock3. Custom exception ClassesClass Subclassexception (Exception):p4. Catching exceptionsUsing try/except>>> Try:... x = input (' Enter the first number: ')... y = input (' Enter the second number: ')... print x/y... except Zerodivisionerror:... print "The second number can ' t be zero!"...Enter th

Java learns java from scratch (enumeration definition and simple use), and Java starts from scratchI. Enumeration Enumeration refers to a type composed of a set of fixed constants, indicating a specific data set, but all possible values are known when this data set is defined. We recommend that you use uppercase letters for the names of enumerated constants. Enumerated constants are static enumerated fields, which are separated by commas. Use the enum

Java learns 26 from scratch (Packaging class), and java starts packaging from scratchI. Packaging A packaging class encapsulates a basic type into a class. That is, the basic data type is encapsulated into a class type. Java programming provides a packaging class for each basic type. These packaging classes are in the java. lang package. There are 8 packaging classes. Ii. constructor and static methods of the packaging Class 2.1, first Public Type (ty

Java learns thirty (String and StringBuffer classes) from scratch, and java clears stringbufferI. StringBuffer connection character operations when the content of a string needs to be changed frequently, use StringBuffer TO USE THE append () method in StringBuffer to complete string connection operations II. Common StringBuffer Methods No. Method Definition Type Description 1 Public StringBuffer () Structure StringB

Java learns thirteen from scratch (encapsulation), and java encapsulates from scratch1. What is encapsulation and why? For object-oriented objects, encapsulation is to package methods and attributes into a program unit, and this unit is implemented in the form of classes. To put it simply, blocking is to privatize attributes and provide public methods to access private attributes. Encapsulation: Encapsulation reflection and the relative independence

Java learns from scratch (inheritance), and java inherits from scratchI. Inheritance Inheritance and reuse of previous code is very easy. It can greatly shorten the development cycle, reduce development costs, and increase program maintainability. Inheritance is A way to enable duplicate Class A to directly use the attributes and methods of another class B. Class A can have its own attributes and Methods Ii. Inheritance implementation class inheritan

Python learns Day 9 property multi-inheritance Mixin, pythonmixin When binding an attribute, If we expose the attribute directly, although it is easy to write, but we cannot check the parameter, so we can change the score as needed: s = Student()s.score = 9999 To limit the score range, you can use the set_score () method to set the score and get_score () to obtain the score. In this way, in the set_score () method, you can check the parameters: class

Java learns from scratch (identifiers and keywords), starts from scratch andIdentifier, keyword, comment 1, identifier The packages, classes, methods, parameters, and variable names in Java are composed of letters, numbers, underscores (_), and dollar signs ($) in any order, Identifier: it cannot start with a number or be a reserved keyword in JAVA. For example, yourname, yourname_dxh, li_yourname, and $ yourname are all valid identifiers. Class, 67.9

Java starts from scratch (select the structure), and java learns the structure from scratchI. program structure: Generally, the program structure includes the following three types:1. Sequence Structure 2. Selection structure 3. Cycle Structure 2. Sequence Structure The program runs row by row. After a statement is executed, the next statement is executed until the end of the program. 3. Select structure the structure is determined based on whether th

hash table of key-value pairsIn the end, it is not summed up, copy other people's Bar(1) Python is a dynamic, strongly typed language that does not have to define its type until it is used, but must be declared and initialized, (2) "All naming is a reference", where the variable name is a reference to the object, and the same variable name can represent different types of data at different stages of the program's Run; (3) " All data is the object ", Python all data types are objects, (compared

() method can look for an existing or new browser window.Grammar:window.open ([URL], [window name], [parameter string])Parameter description:URL: Optional parameter, in the window to display the Web page's URL or path. If this argument is omitted, or if its value is an empty string, then the window will not display any documents. Window name: Optional parameter, the name of the window being opened. 1. The name consists of letters, numbers, and underscore characters. 2. "_top "," _blank ",

Viewcontroller:uiviewcontroller, uigesturerecognizerdelegate {@IBOutlet weak var image:uiimageview ! Override Func Viewdidload () {super.viewdidload ()//drag Let pan = Uipangesturerecognizer (target:self , Action:Selector.init ("Panview:")) Pan.delegate = self Self.image.addGestureRecognizer (PAN)//rotate Let rotate = Uirotationgesturerecognizer (target:self, Action:Selector.init ("Rotateview:")) Rotate.delegate = Self Self.image.addGestureRecognizer (rotate)//zoom Let pinch = U

intTotal = [ Self. Foods[Component] count];generate random numbers based on the total number of each column (the currently generated random number) intRandomnumber = arc4random ()% Total;//Gets the currently selected row (the row that was last randomly moved to) intOldrow = [ Self. PickerviewSelectedrowincomponent:0];//NSLog (@ "Oldrow =%d", oldrow); //compares the last line number with the currently generated random number if the same rebuild while(Oldrow =