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When should null values of Boolean be used?

... in a collection (List, Map, etc.) to represent a nullable boolean (coming from a nullable boolean column in a database, for example). The null value might mean "we don't know if it's true or false" in this context. each time a method needs an Object as argument, and you need to pass a boolean value...
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How to convert a Bitmap to Drawable in android?

... Sounds like you want to use BitmapDrawable From the documentation: A Drawable that wraps a bitmap and can be tiled, stretched, or aligned. You can create a BitmapDrawable from a file path, an input stream, through XML inflation, or from a Bitmap object. ...
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How should I unit test threaded code?

...I'm working on a project that is inherently multithreaded. Events come in from the operating system and I have to process them concurrently. The simplest way to deal with testing complex, multithreaded application code is this: If its too complex to test, you're doing it wrong. If you have a s...
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How to paste in a new line with vim?

... Shortly after :help p it says: :[line]pu[t] [x] Put the text [from register x] after [line] (default current line). This always works |linewise|, thus this command can be used to put a yanked block as new lines. :[line]pu[t]!...
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classical inheritance vs prototypal inheritance in javascript

...tion is defined as "a general concept formed by extracting common features from specific examples". However for the sake of this explanation we're going to use the aforementioned definition instead. Now some objects have a lot of things in common. For example a mud bike and a Harley Davidson have a...
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What is the optimal length for an email address in a database?

...ed in RFC3696 Errata ID 1690. I got the original part of this information from here share | improve this answer | follow | ...
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Cannot import the keyfile 'blah.pfx' - error 'The keyfile may be password protected'

...look like sn -i companyname.pfx VS_KEY_3E185446540E7F7A This must be run from the location of your PFX file, if you have the solution loaded in VS 2010 you can simply right click on the pfx file from the solution explorer and choose Open Command Prompt which will launch the .net 2010 cmd prompt to...
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What is the Git equivalent for revision number?

... the revision number. I also had trouble with this when I made the switch from SVN to git. You can use "tagging" in git to tag a certain revision as the "release" for a specific version, making it easy to refer to that revision. Check out this blog post. The key thing to understand is that git c...
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Best way to do multiple constructors in PHP

... protected function fill( array $row ) { // fill all properties from array } } ?> Then if i want a Student where i know the ID: $student = Student::withID( $id ); Or if i have an array of the db row: $student = Student::withRow( $row ); Technically you're not building mult...
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Can Selenium interact with an existing browser session?

...th Firefox). I'm going to launch a regular IEDriver and comunicate with it from other proccesses using a middleware. If you have an idea why the class isn't working on IE I would appreciate it. Thank you. – Angel Romero Dec 2 '11 at 11:51 ...