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European text, 3 bytes in Asian textGBK: English is 1 bytes, Chinese is 2 bytesIn Python3, strings exist in memory that is Unicode encoded, cannot be transferred directly or stored on the hard disk, to be converted to bytes type, Unicode to Bytes:a.endode (' encoded '), bytes to Unicode:a.decode ( ' Encoding ')Utf-8 and GBK, gb2312 and other coding methods do not recognize, if you want to convert, first decoding (decode) into Unicode mode, and then encode (encode) into the corresponding way.A =

Iv. Publishing with Services.xml file WebServiceThe Java class created by the previous webservices cannot have a package name, where a configuration file Services.xml can be used to build a package name WebServiceFirst create the MyService class, under Service packagePackage Service;import Javax.jws.webparam;public class MyService {public String getgreeting (@WebParam (name= "name") String name) {return "Hello" + Name;} public void Update (@WebParam (

1, Wiindow.onload and $ (document). The difference between readyWindow.onload can only appear once, $ (document). Ready can appear multiple timesWindow.onload needs to wait until all the files have been loaded before loading, $ (document). Ready just wait for the document structure to load and start loading2. What operations can cause memory leaks?A memory leak refers to any object that persists after it is no longer owned or needed(1) settimeout A memory leak when the first parameter is a strin

While General syntaxWhile control condition: EXECUTE statementThe execution statement is executed until the control condition is false.• Infinite LoopsWhile True: Execute statementIt is very dangerous to be able to execute the process all the time, and we will only see them on certain occasions. For example, some servers need to listen to a client every minute of the time to connect. These clients may make requests to the server at any time, so it is necessary for the server's listener to remain

PythonThe problem of division in Python2 1 >>> 3/6 2 0 3 >>> 3.0/6 4 0.5 5 >>> 3.0/6.0 6 0.5 8 2 9 >>> 6.0/310 2.011 >>> 10.0/312 3.3333333333333335 >>> 0.2 +0.914 1.115 >>> 0.2 +0.1 16 0.30000000000000004 Because the computer to convert our input decimal into binary, floating-point number conversion binary, there will be a problem 0.1 to bits 0.000110011 conversion will not be exactly equal to the decimal 0.1, generally we will be rounding the results reserved two bits, for c

, this mechanism is called re-entry, when the parent class F method attempts to add a lock on this object, because the current thread has the lock of this object, it can also be understood as the key to open it, so the same thread on the same object has not been released before the second lock is not a problem, This lock actually does not add, it has the key, regardless of add a few or can enter the lock Protection Code section, unimpeded, so called re-entry, we can simply think that the second

1. Judge that the second date is larger than the first dateHow to use the script to determine the user input string is the following time format 2004-11-21 must ensure that the user input is this format, and is the time, such as the month is not greater than 12 and so on, in addition I need the user to enter two, and the latter one later than the previous night, only allowed to use JavaScript, Please give me a detailed answer,You can use regular expressions to judge the format in advance and the

00007ffba5c40453 [DEBUGGERU2MCATCHHANDLERFRAME:000000E3AB40F0C8]000000e3ab40f268 00007ffba5c40453 [contexttransitionframe:000000e3ab40f268]000000e3ab40f488 00007ffba5c40453 [debuggeru2mcatchhandlerframe:000000e3ab40f488]After a few take a few take a long time to see, it is like this.In fact, I saw the first one, the heart click Stops, the reason is belowHttp://blogs.msdn.com/b/tess/archive/2009/12/21/high-cpu-in-net-app-using-a-static-generic-dictionary.aspxIn fact, this problem happened to Wu

class Myservlet extends HttpServlet {public void doget (HttpServletRequest request,httpservletresponse response) throws Servletexception, IOException {......}}HttpServletRequest and HttpServletResponse instances are injected dynamically by the servlet container at run time.2.Setter Set InjectionThe dependency injection mechanism based on setup mode is more intuitive and more natural.public class ClassA {Private Interfaceb CLZB;public void Setclzb (Interfaceb clzb) {THIS.CLZB = CLZB;}......}3. C

{ 3 if(S[root2] S[ROOT1])4S[ROOT1] =Root2; 5 Else 6 { 7 if(S[ROOT1] = =S[root2])8s[root1]--; 9S[ROOT2] =root1; Ten } One}View Code Path compression For deeper trees, the find operation is time-consuming and recursive to the root of the tree step-by-step.Improved thinking: After executing a find, let all nodes in the path point directly to the root, without pointing to the father, so that the next time you find the root can be quickly found, save time.P

1. Collection2. Dictionaries3. Operator Precedence1. CollectionCreate: () set () Note: Create an empty collection with Set () Feature: element unique, unordered operation: (Intersection)-(set)-(difference) method: S.add (x) #添加单个元素s. Update () #添加多个元素s. Remove () #移除元素s. Clear () #清空集合 # collection creation >>> SE = { 2. Dictionary Note: Is the only mapping type created in Python: {key:value} #大括号创建字典的键时要加引号dict {key=value} #括号里赋值方式, name = object, do not quote the key and value in the diction

parameters from the arguments passed, you can use the Parse_known_args () method to pass other arguments to other scripts.Argumentparser.parse_known_args (Args=none, Namespace=none)It works very much like Parse_args (), but instead of generating an error when an extra parameter is present, it returns a tuple and list that contains the fill namespace and the remaining argument stringImport Argparseparser = Argparse. Argumentparser () parser.add_argument (' Bar ') parser.add_argument ('-t ', '--t

are destroyed; the destruction of the global execution environment is performed when the Web page or browser is closed;5. Execution flow: Each function has its own execution environment, when the execution flow enters a function, the environment of the function is pushed into an environment stack, and when the function is executed, the stack will eject its environment and return control to the previous execution environment;6. Scope Chain: When the code is executed in the environment, a chain o

abstract method, the completion of the business function of the subclass should implement the method,Finally, whether the commit transaction or the rollback transaction is successfully determined based on the Dojob method.2. Transformation of Business Processing class Accountservice/** * Business Logic Layer */public class Accountservice {public void Transfer (final account out, final account in, Final int. money) thro WS SQLException {new transactiontemplate () {@Overrideprotected void Dojob (

status in the end? Use cookies to use the session?2, technology selection, you can use the original as far as possible with the original. Net Core has the default Useauthentication implementation, so let's use it.3, the system although help us to achieve, but the login process is actually more complex, do the framework best to understand the general principle. Our framework will also transform it.After study, the system default login implementation does not support load balancing environment, w

use of partial views is actually the same as the view, but the difference between the distribution view and the view is that the partial view is disabled layout, that is to say the above section in the partial view of the use is meaningless, let's look at the definition of the partial viewFigure 5650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/40/EC/wKioL1PPnu7B6nRiAAGMa-Vt5og481.jpg "title=" View5.png "alt=" Wkiol1ppnu7b6nriaagma-vt5og481.jpg "/>Figure 5 does not create a strongly-t

array for(inti=0;i//using fou loops to output informationSystem.out.print ((i+1) + "month has" +day[i]+ "Day" + "\t\t"); if((i+1)%3==0) {//If the sum of i+1 is zeroSystem.out.print ("\ n");//Output Enter } } }}The execution results are shown below:January There are 31 days in February there are 28 days March There are 31 days April There are 30 days May has 31 days June has 30 days July has 31 days August has 31 days

activated.Beans that do not have a profile specified will always be created.@Configuration Public class aconfigclass{@Bean @Profile ("A") MethodA () {...};@Bean @Profile ("B") MethodB () {...}; }3. Configure multiple profiles in XMLThe following ...4. How to activate a profile?Spring relies on two independent properties when determining whether a profile is activated:A---spring.profiles.activeB---Spring.profiles.defaultIf the A property is set, its value is preferred by spring to determine

top heap is very ingenious, it is classified as the choice of the reason for the sorting may be because, when making the node adjustment, the three nodes to choose the maximum value as the root node.Take a look at the time, space complexity, stability, and application scenarios for heap sequencing:Figure 5 Heap sequencing related performanceAs you can see, the time complexity of the heap ordering is O (NLGN), and the spatial complexity is O (1), which is the in-place sort. When there are many e

int print () { System.out.println ("s"); return 1; } public static void Main (string[] args) { System.out.println ("First");} }Is the result of printing first? Wrong. Although the main method is executed, but see son this need static initialization of I did not, the result is S,first?This also has the initialization problem, son is inherit father, then the compiler will load father, and initialize I, that father inherit grandfather, then the compiler will go to loa