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How can I count occurrences with groupBy?
...s.groupingBy(Function.identity(), Collectors.counting()));
System.out.println(counted);
}
}
Result:
{Hello=2, World=1}
(There's also the possibility of using groupingByConcurrent for more efficiency. Something to bear in mind for your real code, if it would be safe in your context....
“is” operator behaves unexpectedly with integers
... compare integers.
This isn't behavior you should have any expectations about.
Instead, use == and != to compare for equality and inequality, respectively. For example:
>>> a = 1000
>>> a == 1000 # Test integers like this,
True
>>> a != 5000 # or this!
True
...
convert pfx format to p12
...em key and an encrypted private pem key:
openssl pkcs12 -in cert.pfx -out cert.pem -nodes -nokeys
openssl pkcs12 -in cert.pfx -out cert_key.pem -nodes -nocerts
openssl rsa -in cert_key.pem -out cert_key.pem -des3
The first two commands may prompt for an import password. This will b...
Parse date string and change format
...ess the input date string's format. format2 is the target string format to output.
– ThorSummoner
Apr 15 '15 at 21:45
...
Git: fatal: Pathspec is in submodule
.... In my specific case, I had git cloned an extension and ran git add . without thinking too much. Git decided to create a submodule, which I didn't like. So I removed directory/.git and ran into Git: fatal: Pathspec is in submodule. I couldn't find out how to remove the submodule stuff. Fixed with t...
How can I catch a 404?
...
can I get the NUMBER out somehow from the objects without making my own lookup list? I would like to have something like: int httpresponsecode = HttpStatusCode.ToInt() or similar so I get 404
– BerggreenDK
A...
Should I use multiplication or division?
...
Always use whatever is the clearest. Anything else you do is trying to outsmart the compiler. If the compiler is at all intelligent, it will do the best to optimize the result, but nothing can make the next guy not hate you for your crappy bitshifting solution (I love bit manipulation by the wa...
Convert list to tuple in Python
...l) will convert a list l into a tuple:
In [1]: l = [4,5,6]
In [2]: tuple
Out[2]: <type 'tuple'>
In [3]: tuple(l)
Out[3]: (4, 5, 6)
However, if you've redefined tuple to be a tuple rather than the type tuple:
In [4]: tuple = tuple(l)
In [5]: tuple
Out[5]: (4, 5, 6)
then you get a TypeE...
getResourceAsStream returns null
... with "/". I am not sure whether this is necessary, but I have problem without it.
– David
Nov 15 '15 at 7:54
4
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The shortest possible output from git log containing author and date
How can I show a git log output with (at least) this information:
13 Answers
13
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