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What is the most frequent concurrency issue you've encountered in Java? [closed]
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Double-Checked Locking. By and large.
The paradigm, which I started learning the problems of when I was working at BEA, is that people will check a singleton in the following way:
public Class MySingleton {
private static MySingleton s_instance;
public static MySingleton getInsta...
How do I split a string with multiple separators in javascript?
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I had missed that optimization, you're right we can start at tokens[1] to save one iteration as tokens[0] == tempchar and we split on tempchar after iterating over tokens to finish up. I'll update the answer accordingly thanks @tic :).
– Brian
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Passing base64 encoded strings in URL
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Nice answer. You can use PHP code without the starting and ending tags on this site if the question is tagged php (also most often it's clear from the context of the question). If you add two spaces at the end of a line you will see the <br>, so no need to type muc...
How to configure postgresql for the first time?
... /etc/postgresql. Also, you can use Nano or other editor instead of VIM.
Restart the database :
sudo /etc/init.d/postgresql restart
(Here you can check if it worked with psql -U postgres).
Create a user having the same name as you (to find it, you can type whoami):
sudo createuser -U postg...
Email validation using jQuery
... however, it still could be written in better way. None part of domain can start with other char than [a-z0-9] (case insensitive). Also, valid e-mail (and domain) has some len limit, which is also not tested.
– tomis
Jul 5 '13 at 8:42
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Can someone explain how to implement the jQuery File Upload plugin?
...lt;/div>
JS
$(".target").dropper({
action: "upload.php",
}).on("start.dropper", onStart);
function onStart(e, files){
console.log(files[0]);
image_preview(files[0].file).then(function(res){
$('.dropper-dropzone').empty();
//$('.dropper-dropzone').css("background-image",res.data);
$(...
Android Fragment onClick button Method
... return a;
}
}
http://developer.android.com/training/basics/firstapp/starting-activity.html
http://developer.android.com/training/basics/fragments/communicating.html
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Unit testing with Spring Security
...there is no way to easily inject or autowire it out of the box.
Before we started to use Spring Security, we would create a session-scoped bean in the container to store the Principal, inject this into an "AuthenticationService" (singleton) and then inject this bean into other services that needed ...
Get MD5 hash of big files in Python
...2084795 open always opens a fresh file handle with the position set to the start of the file, (unless you open a file for append).
– Steve Barnes
Jul 5 '17 at 9:15
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Most efficient way to concatenate strings?
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StringBuilder has a huge comparable start-up cost, it's only efficient when used with very large strings, or very many concatenations. It isn't trivial to find out for any given situation. If performance is of issue, profiling is your friend (check ANTS).
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