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Regex group capture in R with multiple capture-groups
...act group capture from a regular expression match? As far as I can tell, none of grep , grepl , regexpr , gregexpr , sub , or gsub return the group captures.
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To switch from vertical split to horizontal split fast in Vim
... it seems like you can drop the Ctrl-w t part because if you're already in one of only two windows, what's the point of making it current?
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Convert Set to List without creating new List
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We can use following one liner in Java 8:
List<String> list = set.stream().collect(Collectors.toList());
Here is one small example:
public static void main(String[] args) {
Set<String> set = new TreeSet<>();
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Why doesn't Mockito mock static methods?
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It may also be worth adding that some TDD/TBD proponents perceive the lack of static method and constructor mocking as a good thing. They argue that when you find yourself having to mock static methods or constructors, then this is an indicator for poor class design. For ins...
JPA getSingleResult() or null
... a primary key lookup technically there could be multiple results (even if one, both or the combination of your foreign keys or constraints makes this impossible in practice) so this is probably the more appropriate solution.
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Why is i++ not atomic?
...e fields. So unless you will treat every field as implicitly volatile once one thread has used the ++ operator on it, such an atomicity guaranty would not solve concurrent update issues. So why potentially wasting performance for something if it doesn’t solve the problem.
– H...
Best XML parser for Java [closed]
... Woodstox is the right way, but you have to write more code to get things done and you have to get used to process XML in streams.
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Naming threads and thread-pools of ExecutorService
...n thread factory, which will create thread with appropriate names. Here's one example:
class YourThreadFactory implements ThreadFactory {
public Thread newThread(Runnable r) {
return new Thread(r, "Your name");
}
}
Executors.newSingleThreadExecutor(new YourThreadFactory()).submit(some...
Java: Integer equals vs. ==
...@Thilo True, always use equals() when dealing with objects. This should be one of the first things one should know when learning Java. By the way, I would have guessed that the constructor of Integer was private, i.e. that instances were always created through the valueOf() method. But I see that th...
What is the proper way to check for existence of variable in an EJS template (using ExpressJS)?
On the EJS github page, there is one and only one simple example:
https://github.com/visionmedia/ejs
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