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What is the opposite of :hover (on mouse leave)?

Is there any way to do the opposite of :hover using only CSS? As in: if :hover is on Mouse Enter , is there a CSS equivalent to on Mouse Leave ? ...
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.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?

Assuming I have an ArrayList 9 Answers 9 ...
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Why can't overriding methods throw exceptions broader than the overridden method?

I was going through SCJP 6 book by Kathe sierra and came across this explanations of throwing exceptions in overridden method. I quite didn't get it. Can any one explain it to me ? ...
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Why should hash functions use a prime number modulus?

A long time ago, I bought a data structures book off the bargain table for $1.25. In it, the explanation for a hashing function said that it should ultimately mod by a prime number because of "the nature of math". ...
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Copy all the lines to clipboard

Is there any way to copy all lines from open file to clipboard in VI editor. I tried y G but it's not using clipboard to store those lines. ...
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How do I add a new sourceset to Gradle?

I want to add integration tests to my Gradle build (Version 1.0). They should run separately from my normal tests because they require a webapp to be deployed to localhost (they test that webapp). The tests should be able to use classes defined in my main source set. How do I make this happen? ...
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Visual Studio 2010 - recommended extensions [closed]

What are your recommended extensions for Visual Studio 2010? (Please indicate if its free or not And also its purpose / function too) ...
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Is there a WebSocket client implemented for Python? [closed]

...erver/ for a WebSocket server, but I need to implement a WebSocket client in python, more exactly I need to receive some commands from XMPP in my WebSocket server. ...
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How to calculate the number of occurrence of a given character in each row of a column of strings?

I have a data.frame in which certain variables contain a text string. I wish to count the number of occurrences of a given character in each individual string. ...
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How do I remove code duplication between similar const and non-const member functions?

Let's say I have the following class X where I want to return access to an internal member: 19 Answers ...