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Operation on every pair of element in a list
...4
. . . 3,4
. . . .
All three of these functions were introduced in Python 2.6.
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What is the “volatile” keyword used for?
...
Consider this example:
int i = 5;
System.out.println(i);
The compiler may optimize this to just print 5, like this:
System.out.println(5);
However, if there is another thread which can change i, this is the wrong behaviour. If another thread c...
Difference between Arrays.asList(array) and new ArrayList(Arrays.asList(array))
...t(ia)
It takes an array ia and creates a wrapper that implements List<Integer>, which makes the original array available as a list. Nothing is copied and all, only a single wrapper object is created. Operations on the list wrapper are propagated to the original array. This means that if you ...
If table exists drop table then create it, if it does not exist just create it
...it with an old one (table contents are lost):
CREATE TABLE `bla__new` (id int); /* if not ok: terminate, report error */
RENAME TABLE `bla__new` to `bla`; /* if ok: terminate, report success */
RENAME TABLE `bla` to `bla__old`, `bla__new` to `bla`;
DROP TABLE IF EXISTS `bla__old`;
You should che...
Variable is accessed within inner class. Needs to be declared final
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@ignis I'm getting a NullPointerException error on addSiteButton.setOnClickListener(new View.OnClickListener() { do you have any idea why that would be coming up?
– PhDeOliveira
Jan 21 '13 at 16:52
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Anonymous recursive PHP functions
...) {
if( $n == 1 ) return 1;
return $factorial( $n - 1 ) * $n;
};
print $factorial( 5 );
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How to make Java honor the DNS Caching Timeout?
...d a fixed domain name. Through some DNS magic, the domain name is resolved into an IP that's closest to the server with least load. For the load-balancing to work, the application server needs to honor the TTL from DNS response and to resolve the domain name again when cache times out. However, I co...
How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
...quence of commands should do the trick:
ALTER TABLE test1 ADD COLUMN id INTEGER;
CREATE SEQUENCE test_id_seq OWNED BY test1.id;
ALTER TABLE test ALTER COLUMN id SET DEFAULT nextval('test_id_seq');
UPDATE test1 SET id = nextval('test_id_seq');
Again, in recent versions of Postgres this is ...
C++ static virtual members?
... think that static virtuals are meaningful. It would be possible to define interface classes and include static methods that have to be implemented in derived class.
– bkausbk
Jan 24 '13 at 7:43
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Simplest way to serve static data from outside the application server in a Java web application
...n some suggestions like having the image directory being a symbolic link pointing to a directory outside the web container, but will this approach work both on Windows and *nix environments?
If you adhere the *nix filesystem path rules (i.e. you use exclusively forward slashes as in /path/to/files)...