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Why is Java's SimpleDateFormat not thread-safe? [duplicate]

Please tell with a code example why is SimpleDateFormat not threadsafe. What is the problem in this class? Is The problem with format function of SimpleDateFormat ? Please give a code which demonstrates this fault in class. ...
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How do I split a string with multiple separators in javascript?

How do I split a string with multiple separators in JavaScript? I'm trying to split on both commas and spaces but, AFAIK, JS's split function only supports one separator. ...
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Check if a Bash array contains a value

...advantage of not needing to loop over all the elements (at least not explicitly). But since array_to_string_internal() in array.c still loops over array elements and concatenates them into a string, it's probably not more efficient than the looping solutions proposed, but it's more readable. if [[...
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How to break a line of chained methods in Python?

... You could use additional parenthesis: subkeyword = ( Session.query(Subkeyword.subkeyword_id, Subkeyword.subkeyword_word) .filter_by(subkeyword_company_id=self.e_company_id) .filter_by(subkeyword_word=subkeyword_word) ...
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What is the difference between IEqualityComparer and IEquatable?

I want to understand the scenarios where IEqualityComparer<T> and IEquatable<T> should be used. The MSDN documentation for both looks very similar. ...
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Most efficient T-SQL way to pad a varchar on the left to a certain length?

... This is simply an inefficient use of SQL, no matter how you do it. perhaps something like right('XXXXXXXXXXXX'+ rtrim(@str), @n) where X is your padding character and @n is the number of characters in the resulting string (assuming you need the padding because you are dealing with ...
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How to put a delay on AngularJS instant search?

...rformance issue that I can't seem to address. I have an instant search but it's somewhat laggy, since it starts searching on each keyup() . ...
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WCF timeout exception detailed investigation

...e service. The server is running Win 2008 Server. The clients are running either Windows 2008 Server or Windows 2003 server. I am getting the following exception, which I have seen can in fact be related to a large number of potential WCF issues. ...
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In Python, how do I indicate I'm overriding a method?

...ased on this and fwc:s answer I created a pip installable package https://github.com/mkorpela/overrides From time to time I end up here looking at this question. Mainly this happens after (again) seeing the same bug in our code base: Someone has forgotten some "interface" implementing class while r...
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What is meant with “const” at end of function declaration? [duplicate]

I got a book, where there is written something like: 6 Answers 6 ...