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Why doesn't Java allow overriding of static methods?
... are attached to an instance while static methods are attached to a class, etc etc. Still, consider the following code:
public class RegularEmployee {
private BigDecimal salary;
public void setSalary(BigDecimal salary) {
this.salary = salary;
}
public static BigDecimal get...
Unit testing with Spring Security
...ent: session-scoped in a Servlet container, thread-scoped in a JUnit test, etc. The real limiting factor of a Singleton is when it provides an implementation that is inflexible to different environments.
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Programmatically find the number of cores on a machine
...umCPU = sysconf(_SC_NPROCESSORS_ONLN);
FreeBSD, MacOS X, NetBSD, OpenBSD, etc.
int mib[4];
int numCPU;
std::size_t len = sizeof(numCPU);
/* set the mib for hw.ncpu */
mib[0] = CTL_HW;
mib[1] = HW_AVAILCPU; // alternatively, try HW_NCPU;
/* get the number of CPUs from the system */
sysctl(mib, ...
How to Correctly Use Lists in R?
...where the first element is a character vector, the second is a data frame, etc. In this case, you have created two different lists. x has four vectors, each of length 1. x2 has 1 vector of length 4:
> length(x[[1]])
[1] 1
> length(x2[[1]])
[1] 4
So these are completely different lists.
R l...
JavaScript check if variable exists (is defined/initialized)
...(Assuming the variable could hold anything (string, int, object, function, etc.))
28 Answers
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Extract hostname name from string
...uld be considered the root domain (i.e. www.食狮.公司.cn, b.c.kobe.jp, etc.). Read more about it here.
Try:
npm install --save psl
Then with my "extractHostname" implementation run:
let psl = require('psl');
let url = 'http://www.youtube.com/watch?v=ClkQA2Lb_iE';
psl.get(extractHostname(url...
C# Lambda expressions: Why should I use them?
...# expressions in to the SQL expressions desired for filtering / ordering / etc. on the server side.
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Why are Subjects not recommended in .NET Reactive Extensions?
...or support dev guess at WTF was going on. When you use the Create/Generate etc methods you are localizing the effects on the sequence. You can see it all in one method and you know no-one else is throwing in a nasty side effect. If I see a subject fields I now have to go looking for all the places i...
notifyDataSetChanged example
I'm trying to use in my Android Application the notifyDataSetChanged() method for an ArrayAdapter but it doesn't work for me.
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What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
...dexing and unboxed pixels with arbitrary precision (Double, Float, Word16, etc..)
all essential functions like map, fold, zipWith, traverse ...
support for various color spaces: RGB, HSI, gray scale, Bi-tonal, Complex, etc.
common image processing functionality:
Binary morphology
Convolution
Inter...