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Checking if a variable is defined?

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XML serialization in Java? [closed]

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How to format a string as a telephone number in C#

I have a string "1112224444' it is a telephone number. I want to format as 111-222-4444 before I store it in a file. It is on a datarecord and I would prefer to be able to do this without assigning a new variable. ...
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When do you use the Bridge Pattern? How is it different from Adapter pattern?

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Get exception description and stack trace which caused an exception, all as a string

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How do I read / convert an InputStream into a String in Java?

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Adding information to an exception?

... 121 I'd do it like this so changing its type in foo() won't require also changing it in bar(). de...
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Why does AngularJS include an empty option in select?

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Which version of PostgreSQL am I running?

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How to keep one variable constant with other one changing with row in excel

Lets say I have one cell A1, which I want to keep constant in a calculation. For example, I want to calculate a value like this: ...