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Can enums be subclassed to add new elements?
... with numbers, with no automatic validation or anything. IMO enums are the one bit of Java which is actually better than C#.
– Jon Skeet
Nov 13 '10 at 13:21
21
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Design Patterns: Factory vs Factory method vs Abstract Factory
...uit: Apple and Orange.
Factory
Factory is "fixed", in that you have just one implementation with no subclassing. In this case, you will have a class like this:
class FruitFactory {
public Apple makeApple() {
// Code for creating an Apple here.
}
public Orange makeOrange() {
// Cod...
How can I change the color of a Google Maps marker?
I'm using the Google Maps API to build a map full of markers, but I want one marker to stand out from the others. The simplest thing to do, I think, would be to change the color of the marker to blue, instead of red. Is this a simple thing to do or do I have to create a whole new icon somehow? If I ...
Xcode 4.2 debug doesn't symbolicate stack call
... is overwriting your NSSetUncaughtExceptionHandler call (there can be only one handler for your entire app). For example, some 3rd party libraries set their own uncaughtExceptionHandler. So, try setting it at the END of your didFinishLaunchingWithOptions function (or selectively disabling 3rd party ...
Why am I not getting a java.util.ConcurrentModificationException in this example?
...own remove or add methods, the iterator will throw a
ConcurrentModificationException.
This check is done in the next() method of the iterator (as you can see by the stacktrace). But we will reach the next() method only if hasNext() delivered true, which is what is called by the for each to check...
How do I change the language of moment.js?
...ange the language of the date which is being set by moment.js. The default one is English, but I want to set the German language. These is what I tried:
...
MySQL query String contains
...umn` LIKE '%{$needle}%'
");
The % is a wildcard for any characters set (none, one or many). Do note that this can get slow on very large datasets so if your database grows you'll need to use fulltext indices.
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What are the differences between “=” and “
...vel (e.g.,
in the complete expression typed at the command prompt) or as one
of the subexpressions in a braced list of expressions.
Let’s not put too fine a point on it: the R documentation is (subtly) wrong [1]. This is easy to show: we just need to find a counter-example of the = operator ...
How to clone git repository with specific revision/changeset?
How can I clone git repository with specific revision, something like I usually do in Mercurial:
15 Answers
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Is the C# static constructor thread safe?
...stance will be synchronised. There are a variety of ways that this can be done; I've shown one below.
public class Singleton
{
private static Singleton instance;
// Added a static mutex for synchronising use of instance.
private static System.Threading.Mutex mutex;
private Singleton...