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Technically what is the main difference between Oracle JDK and OpenJDK? [duplicate]
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Technical differences are a consequence of the goal of each one (OpenJDK is meant to be the reference implementation, open to the community, while Oracle is meant to be a commercial one)
They both have "almost" the same code of the classes in the Java API; but the code for the virtua...
Java: Difference between PrintStream and PrintWriter
...s. But there has to be a difference, otherwise, there would have been only one class.
7 Answers
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Selectors in Objective-C?
...respondToSelector to see if the receiver implements that method. Can someone offer up a better explanation?
8 Answers
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Regular expression for matching latitude/longitude coordinates?
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This one will strictly match latitude and longitude values that fall within the correct range:
^[-+]?([1-8]?\d(\.\d+)?|90(\.0+)?),\s*[-+]?(180(\.0+)?|((1[0-7]\d)|([1-9]?\d))(\.\d+)?)$
Matches
+90.0, -127.554334
45, 180
-90, ...
Remove empty array elements
...ore filtering it? I think setting a the second time just resets the first one.
– Cullub
Jan 31 '16 at 0:10
5
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How can I reverse the order of lines in a file?
... mentioning: tac (the, ahem, reverse of cat). Part of coreutils.
Flipping one file into another
tac a.txt > b.txt
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MySQL error code: 1175 during UPDATE in MySQL Workbench
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I mentioned that I already disabled the safe update option from the GUI which have the same effect as id I typed the command. However, thanks for your answer, but I already answered my question. Check my answer to know what was the ...
Is memcached a dinosaur in comparison to Redis? [closed]
...they were thinking...oh wait maybe i should add ReJSON because natively no one cares about JSON in the world right
– PirateApp
Dec 20 '17 at 12:12
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How to grep for two words existing on the same line? [duplicate]
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Prescription
One simple rewrite of the command in the question is:
grep "word1" logs | grep "word2"
The first grep finds lines with 'word1' from the file 'logs' and then feeds those into the second grep which looks for lines containing...
How to implement Enums in Ruby?
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I'm surprised that no one has offered something like the following (harvested from the RAPI gem):
class Enum
private
def self.enum_attr(name, num)
name = name.to_s
define_method(name + '?') do
@attrs & num != 0
end
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