difference between iwatch 1 and 2

Through the code porting the error to comb!1. The difference between print functionsIn Python 2.x, you can add spaces or parentheses, but Python 3.x can only be parentheses.# python 2.x>>> print "processing ..." processing...>>> print ("Processing ...") processing...# python 3.x>>> print ("Processing ...") processing .

process.Bootstrap ClassLoader, Extension ClassLoader, App ClassLoader The relationship between the following:Bootstrap ClassLoader is Extension classloader parent,extension ClassLoader is the parent of app ClassLoader.But this is not an inheritance relationship, just a semantic definition, basically, every ClassLoader implementation, there is a parent ClassLoader.The parent of the current ClassLoader can be obtained through the ClassLoader GetParent method. Bootstrap ClassLoader is special beca

programming elements, while the definition of the component model (event model) is the expression of dynamic interaction mode. So what we're emphasizing here is the difference in the benchmarks and priorities set by the solution itself. From the user's community power, there is no doubt that the MVC model has gained more favor among programmers. There are many reasons for this, and we do not want to expand our discussion of the two different programm

1 function GetDays (strdatestart,strdateend) {2 var strseparator = "-";//Date Separator3 var oDate1;4 var oDate2;5 var idays;6 odate1= Strdatestart.split (strseparator);7 odate2= Strdateend.split (strseparator);8 var strdates = new Date (odate1[0], odate1[1]-1, odate1[2]);9

"1, basic grammar" second, class member method modifier 1, method modifier function: Control access to member methods. 2. Modifiers for eight methods: public, protected, private, static, final, abstract, native, synchronized public, protected, private, static, Final in the previous article has been explained, here is not to repeat.modifier Description: Abstract

2018-08-04 Preface this question when doing the project today, how to change the login link to the user name after the user login is successfulSolution: OnLoad Load event with Sessionstorage cache and JSAfter the user has successfully logged in, use the cache, set the user name to the cache, and then get it when each page loads.The difference between Localstorage and sessionstoragecommon: All are stored in the browser side, and the same Origindifferen

end of the program, the pool itself needs to be rerlease, and the pool will release each object marked as Autorelease once. If an object retain count is greater than 1 at this point, the object is still not destroyed.Remember one point: If this object is your alloc or new, you need to call release. If you use Autorelease, release only once the retain has occurred (let retain count is always 1).In Arc,Stron

C # differences between heap and stack (to be updated and summarized)Thread Stack: Stack stack for shortManaged heap When developing programs using the. NET Framework, we don't need to worry about the memory allocation problem, because the GC manager gives us everything. If we write the following two sections of code:Code Segment 1: Public int addfive (INT pvalue){Int result;Result = pvalue + 5;Return result;} Code Segment

1) runnable and callable are the same interface* Callable's task can return a value after execution, and Runnable's task is not to return a value (is void); The call method can throw an exception, and the Run method cannot* Run the callable task to get a future object that represents the result of an asynchronous calculation. It provides a way to check whether the calculation is complete, to wait for the completion of the calculation, and to retrieve

execution period of the program.(2) If the external variable is declared with static, the function of the variable is limited to this file module.--------------------------------------------------------------------header file definition and declarationNote the definition of the variable cannot be placed in the header file!!! The general situation in the head file only the declaration of variables, because the header file to be included in other files

item store is less than 1M, not suitable for use by a virtual machineData consistency is differentRedis uses a single-threaded model to ensure that the data is submitted sequentially.Memcache need to use CAS to ensure data consistency. CAS (Check and Set) is a mechanism for ensuring concurrency consistency and belongs to the "optimistic lock" category; The principle is simple: take the version number, the operation, the comparison version number, if the same operation, inconsistent to abandon a

In spring integrated hibernate, two operations are provided for Dao layer access. (1)Protected final session getsession () throws dataaccessresourcefailureexception, illegalstateexception; Spring API explanation: Obtain a hibernate session, either from the current transaction or a new one. The latter is only allowed if the "allowcreate" setting of this bean 'shibernatetemplate is "true ". Note that this is not meant to be invoked from hibernatetempl

Trivial-difference between hadoop1.X and 2.x,-hadoop1.x2. X 1. jobtracker is separated and divided into resourceManager and nodemanager; 2. MR becomes an application on yarn like HBase and Hive; The default block size of 3.1.x is 64 MB, and the default block size of 2