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When should a class be Comparable and/or Comparator?

I have seen classes which implement both Comparable and Comparator . What does this mean? Why would I use one over the other? ...
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WWW or not WWW, what to choose as primary site name? [closed]

From technical perspective the only issue is traffic and incoming links (one of them should redirect to another). 14 Answe...
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How to stop flask application without using ctrl-c

I want to implement a command which can stop flask application by using flask-script. I have searched the solution for a while. Because the framework doesn't provide "app.stop()" API, I am curious about how to code this. I am working on Ubuntu 12.10 and Python 2.7.3. ...
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Unique Constraint in Entity Framework Code First

...h unique constraints... you may want to create indexes, check constraints, and possibly triggers and other constructs too. Here's a simple pattern you can use with your code-first setup, though admittedly it's not database agnostic: public class MyRepository : DbContext { public DbSet<Whate...
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Scala: Nil vs List()

In Scala, is there any difference at all between Nil and List() ? 3 Answers 3 ...
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app-release-unsigned.apk is not signed

I downloaded the zip file of an Android app on github and I'm trying to run it, but I get a dialog with this message 17 Ans...
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How do I copy an entire directory of files into an existing directory using Python?

...ctory that contains a directory named bar (containing one or more files) and a directory named baz (also containing one or more files). Make sure there is not a directory named foo . ...
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How do I access the request object or any other variable in a form's clean() method?

...gument, request. This stores the request in the form, where it's required, and from where you can access it in your clean method. class MyForm(forms.Form): def __init__(self, *args, **kwargs): self.request = kwargs.pop('request', None) super(MyForm, self).__init__(*args, **kwar...
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jQuery disable/enable submit button

...he last letter i have to press even one more time to capture the empty val and disable my button, cause when i press the backspace to delete the last letter my field is still populated , so my keypress is captured and then the letter is deleted. so...how should i do it right? –...
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Android Webview - Completely Clear the Cache

I have a WebView in one of my Activities, and when it loads a webpage, the page gathers some background data from Facebook. ...