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: value-=2 and value=value-2 equate;The exact expression should be this: Value-2 is equivalent to value= (the type of value) (value-2);So in the compound assignment operation, the result value of his calculation is automatically cast to the left type.Of course, the result is the same as the left-hand type without any effect.What if the type on the left is smaller than the one that calculates the result? Will definitely lose precision, causing bugs such as:Short value=2;//System automatic stealth

instantiating the bean, and using the static factory method also agreed to specify the method parameters, spring The IOC container will call the method specified by this property to get the Bean,3. Use the instance factory method to instantiate the bean, in such a way that the class attribute cannot be specified. You must use the Factory-bean property to specify the factory bean. The Factory-method property specifies the method that instantiates the bean and uses the instance factory method to

availability of APIsSwift's built-in support checks API availability, which ensures that we are no longer on the currently deployed machine, accidentally using an unusable APIThe editor uses the information available in the SDK to verify that all APIs used in our code are available on the deployment target specified by the project, and if we try to use an unusable API, Swift will make an error in the editWe use the availability condition (availability condition) in an If or guard statement to c

File upload page settings:1. The submission of data is to use Method:postEnctype:multipart/from-dataThe default value for *enctype is Application/x-www-from-urlencode, which is the way to pass parameters as key-value pairs.Action: A generic handler path.2. Form elements* The use of httpcontext.request["key", in fact, is: 1. Find the URL there is no key;2. Find out whether there are any in the from; 3. Find the cookie that came over.2. Handlers in the server:Httppostedfile file = context. request

, you can also verify that the previous post request is correct by several get requests.Compared to the work of writing documents for these interfaces, our added configuration content is very small and streamlined, and the intrusion into the original code is within the scope of tolerance. Therefore, it is a good choice to add swagger to manage API documents while building restful APIs.A complete example of the results can be viewed chapter3-1-5.Reference information Swagger offici

= "Landscape"--fixed to horizontal screenNine, the concept of the task stackA task stack for an applicationX. Four types of activation modes of activityActivity configuration startup mode: LaunchmodeSingletop: Stack top only oneIf the activity on the stack at the top of the task stack exists, it will not recreate the activity, directly reusing the existing activity, only one at the top of the stack. Application: Browser bookmarksSingletask: The entire stack is only one (when reused, all other ac

-class follow-up tasks"); return null;} 3. Client:public class Client { public static void main(String[] args) { RealSubject real=new RealSubject(); SubjectHandler handler=new SubjectHandler(real); //生成代理类对象 AbstractSubject proxy=(AbstractSubject) Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), new Class[]{AbstractSubject.class},handler); proxy.doSomething(); }}4. Advantages and disadvantages of dynamic agentsAdvantages :The biggest benefit of dynamic proxies compared to sta

multiple HTTP requests/responses instead of creating a new connection for each new requestIf the browser supports keep-alive it will be connected in the headerConnection:keep-aliveWhen the server receives the request, it also adds this to the response when it respondsIf you do this, the connection is not interrupted, but the connection is maintained. When the client sends another request, it uses the same connection to continue to the client or server side to think that the end of the reply, wh

array ' arr.length-= 1;arr.length-= 2 ' * Delete The most subsequent element pop () * Deletes the first element of an array shift () * deletes the specified number of elements at the specified position splice ( index, length) # # # Array traversal* For Loop* For in Span style= "COLOR: #b22222" >### multidimensional array ### Array method *join ([spacer symbol]) stitch Each element of an array into a string return string Span style= "COLOR: #808080" >*slice (start, en

; - window.onload= function(){ - varOUL1=document.getElementById ("UL1"); - varOUl2=document.getElementById ("UL2"); - varobtn=document.getElementById ("BTN1"); in - Obtn.onclick= function(){ to //first find the element in motion (node) + varOLi=Oul1.firstelementchild; - //Console.log (oLi); the //var oLi = oul1.children[0]; * $ //Delete in Ul1Panax No

takes the array as a template, looking for the most value, outputting in some order, and so on. It's a little cumbersome, but it's pretty reliable, though you'll have to create another array.The experiment was completed, but the learning effect was not met.Problem:not the problem, the ones that use How does the software written in Java work? Is there a scenario where the parent and subclass objects fail to convert to each other? It's like I'm using Notepad. does the conversion between the Emplo

Timing Technology(5) Design patterns used in the projectA single example of double check and inner class implementation of a single case to masterPrototype mode can be used to describe the deep cloning of objects. The main inheritance cloneable interface, the implementation of cloning methods:Protected Object Clone () throws Clonenotsupportedexception {...}Reference blog:(1) http://blog.csdn.net/lifetragedy/article/details/43817903(2) Http://blog.csdn.net/jadyer2, clear the overall structure of

\" GuySn:Quoteuid:quoteguyuserPassword:quoteguyspassworddn:uid=space Cadet,ou=space cadets,dc=springframework,dc=Orgobjectclass:topobjectclass:personobjectclass:organizationalPersonobjectclass:inetOrgPersoncn:Space Cadetsn:Cadetuid:space CADETUSERPASSWORD:SPACECADETSPASSWORDDN:CN=developers,ou=groups,dc=springframework,dc=Orgobjectclass:topobjectclass:groupOfUniqueNamescn:developersou:developeruniqueMember:uid=ben,ou=people,dc=springframework,dc=Orguniquemember:uid=bob,ou=people,dc=springframewo

This section also speaks of user and user group managementOr retry the previous user-limited issueCan be used chage can also use USERADD-EChage-l View the user's time limit and some other informationYou can also use USERMOD-E to set time limits.The old boy here said there are many commands to set up some of the same functionsBut all we have to do is use one of our habits and preferences.You don't have to remember anything.And then speaking of Userdel command,Userdel-r User name to delete home di

defined Cacheeventlistener.public class Mycacheeventlistenerfactory extends Cacheeventlistenerfactory { @Override public Cacheeventlistener Createcacheeventlistener (Properties properties) { returnnew mycacheeventlistener (); } } 3. In the Ehcache.xml file, specify the cacheeventlistenerfactory that the current cache uses by cacheeventlistenerfactory the child element of the cache element.We have completed the monitoring of the cache event through the above three step

languages: when defined, you must indicate what the data type is (data type conversions are involved)!Weakly typed languages: Do not specify the data type when defining, all automatically convert!Several data types in JS:Number (Int/float): Digital type!String: Strings (Need to add "")!Boolean: Boolean type (TRUE/FALSE)!NULL: null VALUE!Undefined: Not Found!Object: Objects!Operator:① arithmetic Operator: +-*/% + +--② assignment operator: Give the right thing to the left! = += -= *= /=③ conditio

variables stored in what data must be clear!!!Console.log (Shuzu[shuzu.length-1]);--Always output the last variable (shuzu.length-is not possible, only can-number)!Join ()//array to stringAdd Delete for push () and pop ()///EndShift () and unshift ()//Add Delete for first elementSort ()//Sort (1 3 2 4à1 2 3 4)Reverse ()//InvertConcat ()//connection array ([1,2][3,4]à[1,2,3,4])Slice ()//delete the element at the specified positionSplice ()//delete the element at the specified positionIndexOf ()

strings, Python will help us put the stringCache and point directly to the string the next time you use it. Can save a lot of memory.CodingASCII 8bit 1byte English lowercase capital letters, special characters, numbersGBK 16bit 2byte Chinese compatible ASCIIUNICODE 32bit 4byte Universal footprintUTF-8 Unicode upgrade English 1byte Chinese 3byte1. The ASCII code is used by default in Python2. Therefore, Chinese is not supported. If you need to change the encoding in Python2, you need to write at

, please refer to csdn previous article http://blog.csdn.net/pongba/article/details/1684519. The move constructor and the move assignment operator are described here.1. The move constructor and move assignment operator overloaded functions are not implicitly declared and must be defined by themselves.2. If the user has customized the copy constructor or the move constructor, the default constructor will not be implicitly defined, and if required by the user, an explicit definition is required.3.

packagecn.guagua.mobile.common;importjava.util.concurrent.locks.lock;import Java.util.concurrent.locks.readwritelock;importjava.util.concurrent.locks.reentrantreadwritelock;import org.apache.log4j.Logger;importcn.guagua.mobile.cache.redis.Redis;/*** read/write lock control forced read cache synchronization * @author shma* @date 2014-10-1115:04:28*/publicclass synchcachelock Dogpile effect of java-no.06 read-write lock control cache failure illuminatio