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How do I get the first n characters of a string without checking the size or going out of bounds?
...f a string in Java without doing a size check first (inline is acceptable) or risking an IndexOutOfBoundsException ?
9 Ans...
Remove blank lines with grep
I tried grep -v '^$' in Linux and that didn't work. This file came from a Windows file system.
14 Answers
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Map enum in JPA with fixed values?
I'm looking for the different ways to map an enum using JPA. I especially want to set the integer value of each enum entry and to save only the integer value.
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ContextLoaderListener or not?
A standard spring web application (created by Roo or "Spring MVC Project" Template) create a web.xml with ContextLoaderListener and DispatcherServlet . Why do they not only use the DispatcherServlet and make it to load the complete configuration?
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RESTful Login Failure: Return 401 or Custom Response
...oper response code to send when a failed login has happened.
401 Unauthorized
Similar to 403 Forbidden, but specifically for use when authentication is required and has failed or has not yet been provided. The response must include a WWW-Authenticate header field containing a challenge app...
pinpointing “conditional jump or move depends on uninitialized value(s)” valgrind message
...ge from valgrind and it's been quite the mystery as of where the bad value originated from.
2 Answers
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How to get the last value of an ArrayList
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Won't work. what if the list is empty, list.size() will return 0. and you'll end up with list.get(-1);
– FRR
Jan 21 '15 at 19:36
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CSS Properties: Display vs. Visibility
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The visibility property only tells the browser whether to show an element or not. It's either visible (visible - you can see it), or invisible (hidden - you can't see it).
The display property tells the browser how to draw and show an element, if at all - whether it should be displayed as an inlin...
NoSQL (MongoDB) vs Lucene (or Solr) as your database
...e my lessons learned:
You can easily use Lucene/Solr in lieu of MongoDB for pretty much all situations, but not vice versa. Grant Ingersoll's post sums it up here.
MongoDB etc. seem to serve a purpose where there is no requirement of searching and/or faceting. It appears to be a simpler and arguab...
How to solve PHP error 'Notice: Array to string conversion in…'
I have a PHP file that tries to echo a $_POST and I get an error, here is the code:
5 Answers
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