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Singleton: How should it be used
...ngleton if:
You need to have one and only one object of a type in system
Do not use a Singleton if:
You want to save memory
You want to try something new
You want to show off how much you know
Because everyone else is doing it (See cargo cult programmer in wikipedia)
In user interface widgets
It ...
Why maven? What are the benefits? [closed]
...
Figuring out package dependencies is really not that hard. You rarely do it anyway. Probably once during project setup and few more during upgrades. With maven you'll end up fixing mismatched dependencies, badly written poms, and doing package exclusions anyway.
Not that hard... for toy proje...
Android: How can I pass parameters to AsyncTask's onPreExecute()?
...
public MyAsyncTask(boolean showLoading) {
super();
// do stuff
}
// doInBackground() et al.
}
Then, when calling the task, do something like:
new MyAsyncTask(true).execute(maybe_other_params);
Edit: this is more useful than creating member variables because it si...
How to set entire application in portrait mode only?
How do I set it so the application is running in portrait mode only? I want the landscape mode to be disabled while the application is running. How do I do it programmatically?
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How do I watch a file for changes?
...for changes. Each time a change occurs I'd like to read the new data in to do some processing on it.
24 Answers
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IllegalArgumentException or NullPointerException for a null parameter? [closed]
...w an IllegalArgumentException , or a NullPointerException ? From the javadocs, both seem appropriate. Is there some kind of an understood standard? Or is this just one of those things that you should do whatever you prefer and both are really correct?
...
Why exactly is eval evil?
...reasons why one should not use EVAL.
The main reason for beginners is: you don't need it.
Example (assuming Common Lisp):
EVALuate an expression with different operators:
(let ((ops '(+ *)))
(dolist (op ops)
(print (eval (list op 1 2 3)))))
That's better written as:
(let ((ops '(+ *)))
(dol...
Javascript event handler with parameters
...hat passes the event and some parameters. The problem is that the function doesn't get the element. Here is an example:
7 A...
How do I use PHP namespaces with autoload?
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You don't have to use AS. That's not why this solution works. You could just as easily do: use Person\Barnes\David\Class1; (which is equivalent to use Person\Barnes\David\Class1 as Class1;).
– cartbeforeho...
How do I abort/cancel TPL Tasks?
... =>
{
while (true)
{
// do some heavy work here
Thread.Sleep(100);
if (ct.IsCancellationRequested)
{
// another thread decided to cancel
Console.WriteLine("task ...