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How to set JAVA_HOME in Linux for all users
...ged user, ie. sudo vim
Press 'i' to get in insert mode
add:
export JAVA_HOME="path that you found"
export PATH=$JAVA_HOME/bin:$PATH
logout and login again, reboot, or use source /etc/profile to apply changes immediately in your current shell
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Java HashMap performance optimization / alternative
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As many people pointed out the hashCode() method was to blame. It was only generating around 20,000 codes for 26 million distinct objects. That is an average of 1,300 objects per hash bucket = very very bad. However if I turn the two arrays into a number in base 52 I...
Modifying the “Path to executable” of a windows service
...c command line instead of modifying the registry:
sc config <service name> binPath= <binary path>
Note: the space after binPath= is important. You can also query the current configuration using:
sc qc <service name>
This displays output similar to:
[SC] QueryServiceConfig...
How do I set the proxy to be used by the JVM
Many times, a Java app needs to connect to the Internet. The most common example happens when it is reading an XML file and needs to download its schema.
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Cannot create an array of LinkedLists in Java…?
... to use an array of LinkedList to store the values of a matrix. Each element of the array (i.e. each LinkedList ) represents a row of the matrix. And, each element in the LinkedList array represents a column and the stored value.
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No module named _sqlite3
...a Django app on my VPS running Debian 5. When I run a demo app, it comes back with this error:
21 Answers
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How to fix .pch file missing on build?
...er versions of the IDE may use "pch" rather than "stdafx" in the default names for related files. It may be necessary to substitute pch for stdafx in the instructions below. I apologize. It's not my fault.
Right-click on your project in the Solution Explorer.
Click Properties at the bottom of t...
How to make an image center (vertically & horizontally) inside a bigger div [duplicate]
...if) no-repeat center center;
height: 200px;
width: 200px;
}
(Assumes a div with id="demo" as you are already specifying height and width adding a background shouldn't be an issue)
Let the browser take the strain.
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CSS horizontal centering of a fixed div?
I know this question is a million times out there, however I can't find a solution to my case.
I've got a div, which should be fixed on the screen, even if the page is scrolled it should always stay CENTERED in the middle of the screen!
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What good are SQL Server schemas?
... a schema, but what are they really used for in a typical SQL Server deployment?
12 Answers
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