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Determine if a String is an Integer in Java [duplicate]
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Or you can enlist a little help from our good friends at Apache Commons : StringUtils.isNumeric(String str)
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Can't access RabbitMQ web management interface after fresh install
...is or this RabbitMQ 3.3.1 can not login with guest/guest
# remove guest from loopback_users in rabbitmq.config like this
[{rabbit, [{loopback_users, []}]}].
# It is danger for default user and default password for remote access
# better to change password
rabbitmqctl change_password guest NEWPA...
How do I return multiple values from a function in C?
...t produces a result int and a result string , how do I return them both from a function?
8 Answers
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C++ Double Address Operator? (&&)
...at && address operator is supposed to do. Here is a code example from stl_vector.h :
5 Answers
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image.onload event and browser cache
...ry time. There is no need to ever check .complete when create a new image from scratch like this.
– jfriend00
Sep 10 '12 at 17:24
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Scala @ operator
...1. 8.12, specifically, though I don't know where the "as usual" there came from -- and 8.12 only speak of regular expression pattern (_*). But maybe this has been clarified on a newer version of the spec.
– Daniel C. Sobral
Mar 2 '10 at 22:58
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Is it possible to use 'else' in a list comprehension? [duplicate]
...e if cond else false-value as the statement instead, and remove the filter from the end:
table = ''.join(chr(index) if index in ords_to_keep else replace_with for index in xrange(15))
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C# Sort and OrderBy comparison
...o both questions are "no" then it really doesn't matter which one you pick from a performance perspective.
– Eric Lippert
Dec 2 '09 at 16:10
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Collection that allows only unique items in .NET?
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HashSet<T> is what you're looking for. From MSDN (emphasis added):
The HashSet<T> class provides high-performance set operations. A set is a collection that contains no duplicate elements, and whose elements are in no particular order.
Note that the Ha...
What's the difference between `1L` and `1`?
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From the Constants Section of the R Language Definition:
We can use the ‘L’ suffix to qualify any number with the intent of making it an explicit integer.
So ‘0x10L’ creates the integer value 16 from the hexadec...