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Is it possible to use the instanceof operator in a switch statement?
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This is a typical scenario where subtype polymorphism helps. Do the following
interface I {
void do();
}
class A implements I { void do() { doA() } ... }
class B implements I { void do() { doB() } ... }
class C implements I { void do() { doC() } ... }
Then you can simply call do(...
How do I do an OR filter in a Django query?
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how could this be done programmatically? So, for example be able to have for f in filters: Item.objects.filter(Q(creator=f1) | Q(creator=f2) | ...)
– Alexis
Aug 10 '12 at 20:05
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How do I read the contents of a Node.js stream into a string variable?
...ct on the mail data. The library provides the mail data as a stream, and I don't know how to get that into a string.
18 Ans...
How do I force git pull to overwrite everything on every pull?
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Really the ideal way to do this is to not use pull at all, but instead fetch and reset:
git fetch origin master
git reset --hard FETCH_HEAD
git clean -df
(Altering master to whatever branch you want to be following.)
pull is designed around merg...
Python: How do I make a subclass from a superclass?
In Python, how do you make a subclass from a superclass?
11 Answers
11
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OS X Bash, 'watch' command
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You can emulate the basic functionality with the shell loop:
while :; do clear; your_command; sleep 2; done
That will loop forever, clear the screen, run your command, and wait two seconds - the basic watch your_command implementation.
You can take this a step further and create a watch.sh s...
How do short URLs services work?
How do services like TinyURL or Metamark work?
Do they simply associate the tiny URL key with a [virtual?] web page which merely provide an "HTTP redirect" to the original URL? or is there more "magic" to it ?
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How to do relative imports in Python?
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Everyone seems to want to tell you what you should be doing rather than just answering the question.
The problem is that you're running the module as '__main__' by passing the mod1.py as an argument to the interpreter.
From PEP 328:
Relative imports use a module's __name__...
How do I skip an iteration of a `foreach` loop?
... continue; // Skip the remainder of this iteration. -----+
}
// do work
}
Here's more about the continue keyword.
Update: In response to Brian's follow-up question in the comments:
Could you further clarify what I would do if I had nested for loops, and wanted to skip the iteration of ...
How do you do a limit query in JPQL or HQL?
In Hibernate 3, is there a way to do the equivalent of the following MySQL limit in HQL?
14 Answers
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