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Why does String.valueOf(null) throw a NullPointerException?

... that the most specific method is chosen. A char[] is-an Object, but not all Object is-a char[]. Therefore, char[] is more specific than Object, and as specified by the Java language, the String.valueOf(char[]) overload is chosen in this case. String.valueOf(char[]) expects the array to be non-nu...
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Why use 'git rm' to remove a file instead of 'rm'?

...ml rm 'index.html' $ git status -s D index.html However you can do this all in one go with just git rm $ git status -s $ git rm index.html rm 'index.html' $ ls lib vendor $ git status -s D index.html share | ...
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How do I calculate the date six months from the current date using the datetime Python module?

... @sliders_alpha You need to install the python-dateutil package (pip install python-dateutil) – poiuytrez Nov 19 '13 at 15:29 19 ...
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How to npm install to a specified directory?

Is it possible to specify a target directory when running npm install <package> ? 4 Answers ...
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Eclipse error: “The import XXX cannot be resolved”

...ean also worked for me. What exactly happens (everything just went bonkers all of a sudden) and how does Clean help? – Sabre Runner Sep 22 '13 at 12:31 1 ...
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What is the difference between jQuery: text() and html() ?

...r .html()? Answer: .html() is faster! See here a "behaviour test-kit" for all the question. So, in conclusion, if you have "only a text", use html() method. Note: Doesn't make sense? Remember that the .html() function is only a wrapper to .innerHTML, but in the .text() function jQuery adds an "enti...
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Get specific ArrayList item

..., or perhaps just because it's (by far) the worst of (now) 6 answers which all say essentially the same thing. – Bernhard Barker Aug 13 '15 at 17:37 add a comment ...
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Re-entrant locks in C#

.....} is shorthand for using the Monitor class. As Marc points out, Monitor allows re-entrancy, so repeated attempts to lock on an object on which the current thread already has a lock will work just fine. If you start locking on different objects, that's when you have to be careful. Pay particular ...
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How to determine one year from now in Javascript

...the next year if you do it in December; the date will be adjusted automatically. Same goes for day-of-month via getDate() and setDate(). share | improve this answer | follow ...
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How do you get centered content using Twitter Bootstrap?

...ast I looked, the text-align: center is not default on those classes. Typically the default is going to be left alignment. – ScottS Sep 7 '12 at 22:27 ...