casting - What is the cleanest way to compare an int with a potentially null Integer in Java? -

- 

  मानचित्र & lt; स्ट्रिंग, पूर्णांक & gt; मीटर; मी = नया TreeMap & lt; स्ट्रिंग, पूर्णांक & gt; ();   
 क्या m.get () शून्य है, जब शून्य पॉइंटर अपवाद से बचने के लिए निम्नलिखित कास्ट जोड़ना अच्छा अभ्यास है।  
  System.out println (((पूर्णांक) 8) .equals (m.get ("null")); // गलत लौटता है   
 वैकल्पिक रूप से एक पूर्व नल की जांच के साथ यह थोड़ा बदसूरत दिखने लगती है।  
  System.out.println (m.contains (" शून्य ")! = नल & amp; एम.गेट (" नल ") बराबर (8));   
 क्या यह लिखने का एक बेहतर तरीका है? धन्यवाद।   
 
 
 मैं जब भी संभव हो तो डालने से बचने की कोशिश करता हूं, इसलिए मैं निम्नलिखित का उपयोग करना चाहता हूं, जो भी मेरी राय में अच्छा लगता है:  
  पूर्णांक.वल्यूओफ़ (8) .एक्वायल्स (m.get ("null"))

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: 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

asp.net mvc 3 - MVC routing problem -

-
I have a search form on my page and I want to submit the form using GET. The search form looks like this: @using (Html.BeginForm ("list", "search", FormMethod.Get)) {@ Html.HiddenFor (model => model. CategoryName) @ Html.HiddenFor (model => model.RegionName) & lt; Table class = "plain" & gt; & Lt; TR & gt; & Lt; TD & gt; & Lt; / TD & gt; & Lt; Td> @ Html.TextBoxFor (model => model.FromDate) & lt; / Td> & Lt; / TR & gt; & Lt; TR & gt; & Lt; TD & gt; & Lt; / TD & gt; & Lt; Td> @ Html.TextBoxFor (model => Model ToDate) & lt; / Td> & Lt; / TR & gt; & Lt; TR & gt; & Lt; Td colspan = "2" & gt; & Lt; Input type = "submit" id = "search" value = "search" /> & Lt; / TD & gt; & Lt; / TR & gt; & Lt; / Table & gt; } With a visual model like this: Public categor...
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