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scheduleAtFixedRate vs scheduleWithFixedDelay
...run() method... Basically it's the difference between scheduling something based on when the previous execution ends and when it (logically) starts.
For example, suppose I schedule an alarm to go off with a fixed rate of once an hour, and every time it goes off, I have a cup of coffee, which takes ...
Metadata file … could not be found error when building projects
...s to the solution file in the order in which you want them to build, i.e., based on the mutual dependency order of the projects. This becomes very important if you have projects in the solution that other projects depend upon, but the references have been added as "References" rather than as "Projec...
Unix command to find lines common in two files
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In case anybody wants to do the same thing based on a certain column but doesn't know awk, just replace both $0's with $5's for example for column 5 so you get lines shared in 2 files with same words in column 5
– FatihSarigol
Ja...
Options, Settings, Properties, Configuration, Preferences — when and why?
...tions:
Settings : 24
Options : 15
Preferences : 12
Config(uration) : 1
Based on this, I'd sort these in this order (from general/fixed/app-related to specific/dynamic/user-related):
Settings > Options > Preferences
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How to remove EXIF data without recompressing the JPEG?
...x distros make it available, but in CentOS it's currently available in the base repo.
Usage:
exiv2 rm image.jpg
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Rails Migration: Remove constraint
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have used it in postgresql. rails defines it in the database specific adapter see postgres, mysql. can search for others in apidock. So, will have to check the database adapter for support, in case anyone gets a NotImplementedError
– deepak
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rspec 3 - stub a class method
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Binary Data in MySQL [closed]
...p script to demonstrate the storing of binary files into
// an sql database. More information can be found at http://www.phpbuilder.com/
?>
<html>
<head><title>Store binary data into SQL Database</title></head>
<body>
<?php
...
Why does ConcurrentHashMap prevent null keys and values?
...ining the source code it appears I was wrong - they lock using a "segment" based on a bitmask of the hash.
In that case, I suspect they did it to copy Hashtable, and I suspect Hashtable did it because in the relational database world, null != null, so using a null as a key has no meaning.
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Programmatically selecting text in an input field on iOS devices (mobile Safari)
... FWIW, it works in Chrome Desktop and Android Browser, which are also based on WebKit.
– jrummell
Jun 22 '11 at 18:20
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