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How do I create a list of random numbers without duplicates?
...only need to actually read from the file once, before your loop. It's much more efficient to do this than to seek back to the start of the file and call f1.readlines() again for each loop iteration.
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Vertically align text to top within a UILabel
...abel sizeToFit];
If you have a label with longer text that will make more than one line, set numberOfLines to 0 (zero here means an unlimited number of lines).
myLabel.numberOfLines = 0;
[myLabel sizeToFit];
Longer Version
I'll make my label in code so that you can see what's g...
How do synchronized static methods work in Java and can I use it for loading Hibernate entities?
...access to the database is to make your application terribly slow. Further more, in the code you posted you're building a Session Factory each time, that way, your application will spend more time accessing the DB than performing the actual job.
Imagine the following scenario:
Client A and B attempt...
Conditional Variable vs Semaphore
...).
I generally use synchronization variables like this when I have one or more threads waiting on a single particular condition (e.g. for the queue to be empty).
Semaphores can be used similarly, but I think they're better used when you have a shared resource that can be available and unavailable...
jQuery see if any or no checkboxes are selected
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if ($(":checkbox[name='choices']", form).is(":checked"))
{
// one or more checked
}
else
{
// nothing checked
}
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Rename master branch for both local and remote Git repositories
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branches are just a (name, hash) pair - nothing more, nothing less. There is the reflog on branches, but this is never exposed to remote clients.
– bdonlan
Oct 6 '09 at 21:03
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How to determine if binary tree is balanced?
...es the tree far too many times when computing the heights. Can you make it more efficient?
Super bonus exercise: suppose the tree is massively unbalanced. Like, a million nodes deep on one side and three deep on the other. Is there a scenario in which this algorithm blows the stack? Can you fix the...
MySQL LIKE IN()?
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A REGEXP might be more efficient, but you'd have to benchmark it to be sure, e.g.
SELECT * from fiberbox where field REGEXP '1740|1938|1940';
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How to backup a local Git repository?
...directory in your git config file. Please set it. See "man git config" for more details on git configuration files. Defaulting to the same directroy your git repo is in: ' + directory
when 2 : puts 'Warning: Multiple entries of backup.directory found in your git config file. Will use the last on...
Akka or Reactor [closed]
...sial to recommend Akka at this point (as Jon also noted). Feel free to ask more concrete questions on SO or on the akka-user mailing list.
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follo...