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What is the difference between JVM, JDK, JRE & OpenJDK?
... JDKs.
OpenJDK
OpenJDK is an open-source implementation of the JDK and the base for the Oracle JDK. There is almost no difference between the Oracle JDK and the OpenJDK.
The differences are stated in this blog:
Q: What is the difference between the source code found in the OpenJDK repository, and t...
JavaScript unit test tools for TDD
...ght interest developers familiar with Ruby or Ruby on Rails. The syntax is based on RSpec that are used for testing in Rails projects.
Jasmine specs can be run from an html page (in qUnit fashion) or from a test runner (as Karma).
Jasmine is a behavior-driven development framework for testing your ...
How to enable mod_rewrite for Apache 2.2
...cess file.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
The above .htaccess file (if placed in your DocumentRoot) will redirect all traffic t...
What is NODE_ENV and how to use it in Express?
...it can check the value of the environment variable and do different things based on the value. NODE_ENV specifically is used (by convention) to state whether a particular environment is a production or a development environment. A common use-case is running additional debugging or logging code if ru...
How to pop an alert message box using PHP?
...anguage. This is what allows it do things like INSERT something into a database on the server.
But an alert is rendered by the browser of the client. You would have to work through javascript to get an alert.
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LINQ Join with Multiple Conditions in On Clause
...} equals
new { t2.ProjectID, SecondProperty = t2.Completed } into j1
Based on the comments of @svick, here is another implementation that might make more sense:
from t1 in Projects
from t2 in Tasks.Where(x => t1.ProjectID == x.ProjectID && x.Completed == true)
.Defa...
How can I get the external SD card path for Android 4.0+?
...ll storages (include emulated).
Works correctly on all my devices.
P.S.: Based on source code of Environment class.
private static final Pattern DIR_SEPORATOR = Pattern.compile("/");
/**
* Raturns all available SD-Cards in the system (include emulated)
*
* Warning: Hack! Based on Android sour...
How to update a value, given a key in a hashmap?
... supply it a mapping function, which will be called to compute a new value based on existing one.
For example,
Map<String, Integer> words = new HashMap<>();
words.put("hello", 3);
words.put("world", 4);
words.computeIfPresent("hello", (k, v) -> v + 1);
System.out.println(words.get("...
Is there some way to PUSH data from web server to browser?
...s with HTTP and then upgrade them to two-directional client-server message-based communication.
You can easily initiate the connection from javascript:
var ws = new WebSocket("ws://your.domain.com/somePathIfYouNeed?args=any");
ws.onmessage = function (evt)
{
var message = evt.data;
//decode m...
How can two strings be concatenated?
... for R concatenate strings: http://stat.ethz.ch/R-manual/R-patched/library/base/html/paste.html
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