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Left padding a String with Zeros [duplicate]

I've seen similar questions here and here . 20 Answers 20 ...
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json_decode to array

I am trying to decode a JSON string into an array but i get the following error. 12 Answers ...
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Default behavior of “git push” without a branch specified

I use the following command to push to my remote branch: 12 Answers 12 ...
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Rolling back a remote Git repository

I have a remote Git repository, and I need to roll back the last n commits into cold oblivion. 4 Answers ...
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Removing whitespace between HTML elements when using line breaks

I have a page with a row of about 10 img s. For readability of the HTML, I want to put a linebreak in between each img tag, but doing so renders whitespace between the images, which I do not want. Is there anything I can do other than break in the middle of the tags rather than between them? ...
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Rails: how do I validate that something is a boolean?

Does rails have a validator like validates_numericality_of for boolean or do I need to roll my own? 5 Answers ...
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How to check if mysql database exists

Is it possible to check if a (MySQL) database exists after having made a connection. 21 Answers ...
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About Android image and asset sizes

I need to clarify some doubt about the image assets for my app, 4 Answers 4 ...
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Updating and committing only a file's permissions using git version control

Just turned an some.sh file into an executable ( chmod 755 ... ), the permissions were updated but not the content. Is there a way to commit the file into git, so that the executable bit will be restored/set on clone / checkout / pull ? ...
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Hash String via SHA-256 in Java

By looking around here as well as the internet in general, I have found Bouncy Castle . I want to use Bouncy Castle (or some other freely available utility) to generate a SHA-256 Hash of a String in Java. Looking at their documentation I can't seem to find any good examples of what I want to do. Ca...