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What is the Java string pool and how is “s” different from new String(“s”)? [duplicate]
...g:
In computer science, string interning
is a method of storing only one copy
of each distinct string value, which
must be immutable. Interning strings
makes some string processing tasks
more time- or space-efficient at the
cost of requiring more time when the
string is created or ...
When saving, how can you check if a field has changed?
...erson(models.Model):
name = models.CharField()
__original_name = None
def __init__(self, *args, **kwargs):
super(Person, self).__init__(*args, **kwargs)
self.__original_name = self.name
def save(self, force_insert=False, force_update=False, *args, **kwargs):
...
PHP Error handling: die() Vs trigger_error() Vs throw Exception
...
The first one should never be used in production code, since it's transporting information irrelevant to end-users (a user can't do anything about "Cannot connect to database").
You throw Exceptions if you know that at a certain criti...
How do I get the currently displayed fragment?
...y code to iteratively check each of my fragments, and find out the visible one ...
– Leem.fin
Feb 15 '12 at 14:23
...
IntelliJ: Viewing diff of all changed files between local and a git commit/branch
...now been implemented. In order to compare two branches you do:
Check out one of the branches you want to compare with.
Select the branch you want to compare with in the Git branch popup in the status bar in the bottom right of the IntelliJ window. A popup with some options is shown.
Select the "Co...
Python: json.loads returns items prefixing with 'u'
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Your answer was the most useful one I got, and I think the asker of this question would have really appreciated it: stackoverflow.com/questions/956867/…
– jimh
Mar 19 '16 at 1:17
...
Clojure differences between Ref, Var, Agent, Atom, with examples
...en two Identities needs to change together, the classic example is moving money from one bank account to another, it needs to either move completely or not at all.
Uncoordinated access is used when only one Identity needs to update, this is a very common case.
Synchronous access is used when th...
Facebook API - How do I get a Facebook user's profile image through the Facebook API (without requir
... specify the picture size you want with the type argument, which should be one of square (50x50), small (50 pixels wide, variable height), normal (100 pixels wide, variable height), and large (about 200 pixels wide, variable height)" Via Graph API on Facebook
– user603284
...
MySQL Query GROUP BY day / month / year
...I knew this earlier...so many lines of PHP to do something mysql can do in one line.
– nights
Nov 1 '18 at 3:01
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How to change the value of ${user} variable used in Eclipse templates
...rlhon.net/blog/2005/09/07/eclipse-username/ is a dead link...
Here's a new one: https://web.archive.org/web/20111225025454/http://morlhon.net:80/blog/2005/09/07/eclipse-username/
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