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Java volatile reference vs. AtomicReference

Is there any difference between a volatile Object reference and AtomicReference in case I would just use get() and set() -methods from AtomicReference ? ...
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How to mock a final class with mockito

... Mockito 2 now supports final classes and methods! But for now that's an "incubating" feature. It requires some steps to activate it which are described in What's New in Mockito 2: Mocking of final classes and methods is an incubating, opt-in feature. It uses a ...
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How do I create a category in Xcode 6 or higher?

...; File Select Objective-C file under Sources in iOS or Mac OS respectively and Click Next Now under File Type: choose either Category, Protocol, or Extension PS. Under File Name: whatever you type here will be either the Category, Protocol, or Extension Name. ...
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Hidden features of Python [closed]

...ue In case you're thinking it's doing 1 < x, which comes out as True, and then comparing True < 10, which is also True, then no, that's really not what happens (see the last example.) It's really translating into 1 < x and x < 10, and x < 10 and 10 < x * 10 and x*10 < 100, but...
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Multiple submit buttons on HTML form – designate one button as default [duplicate]

...n; } #buttons input { float: right; } will effectively reverse the order and thus the "Next" button will be the value triggered by hitting enter. This kind of technique will cover many circumstances without having to resort to more hacky JavaScript methods. ...
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Vim search and replace selected text

Let's say we have a text, and I enter visual mode and select some text. How do I quickly do a search for the highlighted text and replace it with something else? ...
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How to get the pure text without HTML element using JavaScript?

I have the 1 button and some text in my HTML like the following: 10 Answers 10 ...
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Unit testing Anti-patterns catalogue

...se method to test another/distinct feature/functionality, a new assertion (and its corresponding actions i.e. Act steps from AAA) rides along in an existing test case. share ...
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simple HTTP server in Java using only Java SE API

...just the Java SE API, without writing code to manually parse HTTP requests and manually format HTTP responses? The Java SE API nicely encapsulates the HTTP client functionality in HttpURLConnection, but is there an analog for HTTP server functionality? ...
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Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?

In multiple courses, books, and jobs, I have seen text fields defined as VARCHAR(255) as kind of the default for "shortish" text. Is there any good reason that a length of 255 is chosen so often, other than being a nice round number ? Is it a holdout from some time in the past when there was a go...