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What is global::?

...ss System { } } If you were to use System where it would be locally scoped in the foo class, you could use: global::System.Console.WriteLine("foobar"); to access the global namespace. Example using System; class Foo { public void baz() { Console.WriteLine("Foo 1"); ...
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Is the creation of Java class files deterministic?

...nces? Is a difference only possibly in theory or does Oracle's javac actually produce different class files for the same input and compiler options? ...
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How do MySQL indexes work?

I am really interested in how MySQL indexes work, more specifically, how can they return the data requested without scanning the entire table? ...
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Error in plot.new() : figure margins too large in R

I'm new to R but I've made numerous correlation plots with smaller data sets. However, when I try to plot a large dataset (2gb+), I can produce the plot just fine, but the legend doesn't show up. Any advice? or alternatives? ...
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What is Persistence Context?

...erence/en/html/architecture.html In Java EE, a persistence context is normally accessed via an EntityManager. http://docs.oracle.com/javaee/6/api/javax/persistence/EntityManager.html The various states an entity can have and the transitions between these are described below: http://docs.jboss.or...
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Android: How can I get the current foreground activity (from a service)?

...atePendingResult()) that the service invokes Have the activity register a callback or listener object with the service via bindService(), and have the service call an event method on that callback/listener object Send an ordered broadcast Intent to the activity, with a low-priority BroadcastReceiver...
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What is reflection and why is it useful?

... say you have an object of an unknown type in Java, and you would like to call a 'doSomething' method on it if one exists. Java's static typing system isn't really designed to support this unless the object conforms to a known interface, but using reflection, your code can look at the object and fin...
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Fatal error: Class 'ZipArchive' not found in

I have a problem that I install 'Archive_Zip 0.1.1' on Linux server, but when I try to run the script to create the zip file it gives the fatal error ...
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Should Github be used as a CDN for javascript libraries? [closed]

.... The last one means less total work for everybody, so it's clearly a win all around, and is more likely the more often we (developers) rely on the CDNs to serve our javascript. ...
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How much size “Null” value takes in SQL Server

... The smallest addressable unit of memory in most computer systems is one byte (typically 8 bits). So in reality, a bit takes a byte. Great answer Mark: +1. – JohnB Sep 16 '10 at 22:23 ...