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Difference between Covariance & Contra-variance
...m these objects.
It works because if you're only taking values out of the API, and it's going to return something specific (like string), you can treat that returned value as a more general type (like object).
Contravariance
Canonical examples: IComparer<in T>, Action<in T>
You can c...
How to get the first element of the List or Set? [duplicate]
...
In Java >=8 you could also use the Streaming API:
Optional<String> first = set.stream().findFirst();
(Useful if the Set/List may be empty.)
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improve thi...
Java SecurityException: signer information does not match
...ependency:tree|grep servlet
Its output:
[INFO] +- javax.servlet:servlet-api:jar:2.5:compile
[INFO] +- javax.servlet:jstl:jar:1.2:compile
[INFO] | +- org.eclipse.jetty.orbit:javax.servlet.jsp:jar:2.2.0.v201112011158:compile
[INFO] | +- org.eclipse.jetty.orbit:javax.servlet.jsp.jstl:jar:1.2.0.v20...
Choosing a stand-alone full-text search server: Sphinx or SOLR? [closed]
...r, Sphinx)
Both offer commercial support. (Solr, Sphinx)
Both offer client API bindings for several platforms/languages (Sphinx, Solr)
Both can be distributed to increase speed and capacity (Sphinx, Solr)
Here are some differences:
Solr, being an Apache project, is obviously Apache2-licensed. Sp...
Find the number of downloads for a particular app in apple appstore [closed]
...
As for iTunes Connect there is now an API, see: stackoverflow.com/questions/1619172/itunes-connect-api
– nylund
Sep 18 '12 at 10:18
add a ...
How to play a notification sound on websites?
...ge
Advantages:
JavaScript-plugin for playing sounds based on Web Audio API with fallback to HTML5 Audio.
Plugin is working on most popular desktop and mobile browsers and can be used everywhere, from common web sites to browser games.
Audio-sprites support included.
No dependecies (jQuery not re...
How do I clone a generic List in Java?
...
docs.oracle.com/javase/8/docs/api/java/util/… Doesn't work because the list sizes are different.
– MLProgrammer-CiM
Mar 30 '16 at 17:59
...
JSON Naming Convention (snake_case, camelCase or PascalCase) [closed]
...n this document Google JSON Style Guide (recommendations for building JSON APIs at Google),
It recommends that:
Property names must be camelCased, ASCII strings.
The first character must be a letter, an underscore (_) or a dollar sign ($).
Example:
{
"thisPropertyIsAnIdentifier": "identifie...
AWS S3 copy files and folders between two buckets
... can get the code name for your bucket's region with this command:
$ aws s3api get-bucket-location --bucket my_bucket
By the way, using Copy and Paste in the S3 web console is easy, but it seems to download from the source bucket into the browser, and then upload to the destination bucket. Using ...
Advantage of creating a generic repository vs. specific repository for each object?
...ed, not every entity has a repository. Queries vary wildly; the repository API becomes as unique as the entity itself.
A pattern I often use is to have specific repository interfaces, but a base class for the implementations. For example, using LINQ to SQL, you could do:
public abstract class Repo...