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How to check if a string contains only digits in Java [duplicate]
...\\d+";
As per Java regular expressions, the + means "one or more times" and \d means "a digit".
Note: the "double backslash" is an escape sequence to get a single backslash - therefore, \\d in a java String gives you the actual result: \d
References:
Java Regular Expressions
Java Character Es...
How do I detect if software keyboard is visible on Android Device or not?
Is there a way in Android to detect if the software (a.k.a. "soft") keyboard is visible on screen?
30 Answers
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linux: kill background task
...
There's a special variable for this in bash:
kill $!
$! expands to the PID of the last process executed in the background.
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Is there a __CLASS__ macro in C++?
... That's a pity it isn't defined like __ CLASS __ , it can be handy at preprocessor stage! :(
– k3a
Aug 23 '10 at 11:51
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Explanation of BASE terminology
...e system unavailable (or inconsistent). So you can see that 'availability' and 'partition tolerance' go hand in hand. There's more detail on this in this article.
– Niels van der Rest
Apr 14 '14 at 18:29
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How do I use format() on a moment.js duration?
... format method on duration objects? I can't find it anywhere in the docs and it doesn't seen to be an attribute on duration objects.
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How do I print the full value of a long string in gdb?
...er it has printed the number of elements set by the set print elements command. This limit also applies to the display of strings. When GDB starts, this limit is set to 200. Setting number-of-elements to zero means that the printing is unlimited.
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In a URL, should spaces be encoded using %20 or +? [duplicate]
...8 which specifies %20.
In theory I think you should have %20 before the ? and + after:
example.com/foo%20bar?foo+bar
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Insert into … values ( SELECT … FROM … )
... the SQL engine of the day ( MySQL , Oracle , SQL Server , Informix , and DB2 ).
26 Answers
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Sort JavaScript object by key
...swers to this question are outdated, never matched implementation reality, and have officially become incorrect now that the ES6/ES2015 spec has been published.
See the section on property iteration order in Exploring ES6 by Axel Rauschmayer:
All methods that iterate over property keys do so ...