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Why use a prime number in hashCode?
... inserted into will only be determined by the least significant entry (the one not multiplied at all). Similar entries will collide. Not good for a hash function.
31 is a large enough prime that the number of buckets is unlikely to be divisible by it (and in fact, modern java HashMap implementation...
Does Java have a complete enum for HTTP response codes?
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I don't think there's one that's complete in the standard Java classes; HttpURLConnection is missing quite a few codes, like HTTP 100/Continue.
There's a complete list in the Apache HttpComponents, though:
org.apache.http.HttpStatus (replaced o...
What is the difference between ArrayList.clear() and ArrayList.removeAll()?
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The source is strong in this one. (To all other answers: Use the source, Luke.) Notice how clear() could be implemented as just the one line, size=0; but garbage-collection wouldn't know to collect the elements in the unreachable portions of the array...
Why is there no String.Empty in Java?
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I'll still +1 you, but I feel dirty because you mentioned StringBuilder without talking about how nine times out of ten it's totally inappropriate to use StringBuilder rather than concatenation.
– Randolpho
Aug 10 '10 at 15:36
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Recursive lambda functions in C++11
... Wondering why this isn't marked as 'answer', and that Python one is classified as 'Answer' ?!
– Ajay
Jan 26 '13 at 6:05
1
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Does “git fetch --tags” include “git fetch”?
...ts from the included perf script, which sets up a situation similar to the one described above:
Test HEAD^ HEAD
----------------------------------------------------------
5550.4: fetch 11.21(10.42+0.78) 0.08(0.04+0.02) -99.3%
That applies only for a situation where:
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Android adb “Unable to open sync connection!”
I can run and debug my Android app on my phone just fine, most of the time. Then, seemingly randomly, when I try to run or debug my app from Eclipse, the Console in Eclipse says:
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namespaces for enum types - best practices
Often, one needs several enumerated types together. Sometimes, one has a name clash. Two solutions to this come to mind: use a namespace, or use 'larger' enum element names. Still, the namespace solution has two possible implementations: a dummy class with nested enum, or a full blown namespace.
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Python Git Module experiences? [closed]
...le' )
# commit
print repo.git.commit( m='my commit message' )
# now we are one commit ahead
print repo.git.status()
Everything else in GitPython just makes it easier to navigate. I'm fairly well satisfied with this library and appreciate that it is a wrapper on the underlying git tools.
UPDATE: I...
JavaScript function to add X months to a date
...Add twelve months to February 29th 2020 (should be February 28th 2021)
Add one month to August 31st 2020 (should be September 30th 2020)
If the day of the month changes when applying setMonth, then we know we have overflowed into the following month due to a difference in month length. In this cas...