java - How Iterator's remove method actually remove an object -

-

We all know that the safest "and possibly only secure" way to remove the object from a collection, first Retrieve the Iterator ; Perform a loop and remove it when necessary; 

  Iterator iter = Archive While (iter.hasNext ()) {object o = iter.next () if (o.equals (what i see)) {iter.remove (); }}   
 What I want to understand, and unfortunately, a deep technical interpretation of this is not found, how it is removed if:  
 < Code> (object o: myCollection (). GetObjects ()) {if (o.equals (what I see)) {myCollection.remove (o); }}   
 will throw a  concurrent correction concept , "in technical terms" " Iterator.remove ()  does? Does this remove the object, break the loop and restart the loop?  
 I see in official documentation: 
  
 
 "Erases the current element. Any attempt to call  InvalidState Exposure  If done, then call () is not called () before calling  remove . "  
 part removes the current element", I A "regular" loop = & gt; (Test equality and remove if necessary), but is iterator loop concurrently improved-why?  
 
 How exactly removes the Iterator element depends on its implementation, which is different for different collections It is possible. Definitely it does not break the loop that you are inside. I have seen how the ArrayList iterator has been executed and here is the code:  
  Public Zero removal () {if (lastRet & Lt; 0) Throw new ones illegally (); CheckForComodification (); Try {ArrayList.this.remove (lastRet); Cursor = final reset; LastRet = -1; Expected ModeCount = modCount; } Hold (index autobuff exception ex) {new concurrent improvement concept (); }}   
 So it checks for concurrent amendments, removes the element by using the public EElest  Delete  method, and matches the pay scale of the list revisions So that concurrent improvements will not be thrown the next day.

Comments

Post a Comment

Popular posts from this blog

php - PDO bindParam() fatal error -

-
I am trying to learn PDO, now I have written this small code, but it gives me a serious error: < P> Fatal error: Call a member function at a non-object dot () ... $ con = new mysqli ("127.0.0.1", "root", "", "csvdangercheck"); $ Query = $ con- & gt; ("Id,` var1`, `var2`) values ​​(" id,: var1,: var2) ";); $ query- & gt; bypass pattern (': id', $ id); $ query- & gt; BindParam (': var1', $ VAL1); $ Query- & gt; bindParam (': var2', $ val2); $ Query-> Executed (); I Trying to use print_r ($ con-> errorInfo ()) but Fatal error: Undefined method mysqli :: errorInfo ( ) ... can someone tell me what am I missing? Flaffeh said, you have PDO Missing Mysqy, try it: $ con = new PDO ('mysql: host = 127.0.0.1; dbname = csvdangercheck', 'root', '');
Read more

logging - How can I log both the Request.InputStream and Response.OutputStream traffic in my ASP.NET MVC3 Application for specific Actions? -

-
For a specific set of tasks, I need to log in to the incoming request inputstream as well as outgoing response. is. I am using an ActionFilterAttribute for this and overriding the OnActionExecuted and OnResultExecuted methods. So I'm starting with this idea ... Public category ActionLoggerAttribute: ActionFilterArrbit {Public Override Zero On-Offed Execution (ActionActioned Contact Filter Filter) {base.OnActionAxecuted (FilterContext); HttpRequestBase request = filterContext.HttpContext.Request; // TODO: Log the request. InputStream} Public Override Zero OnResultExecuted (ResultExecutedContext FilterContext) {base.OnResultExecuted (filterContext); HTTPRPSPointBase Response = FilterContacts Hpptex response; // TODO: Log on Response.OutputStream}} Ideally I'll hook it up with enterprise library logging because I'm already using it for error logging. Am I reaching the input and output stream at the right time? Can I easily use the Enterprise Library to log i
Read more

java - Why my included JSP file won't get processed correctly? -

-
I am trying to create Java web framework (and learning), and on the basis of 'Code Generator In the process of making the material view of the database in the process of development, I stumbled into a difficulty, which I do not know how to solve it. First of all, I want the following index.jsp : & lt; Body & gt; Use all pages to be created. & Lt;% @ include file = "header.jsp"% & gt; & Lt; Hours / & gt; & Lt;% @ included file = "body.jsp"%> & Lt; Hours / & gt; & Lt;% @ include file = "footer.jsp"% & gt; & Lt; / Body & gt; And, in body.jsp , I should have it like this: & lt; Jsp: include page = "$ {Application_modul}"%> Where application_modul is an attribute defined in its controller: request.setAttribute ("application_modul", "USER_ACCOUNT \\ ' View_user_account.jsp "); This file can be found properly, but the processed JSP does
Read more