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File changed listener in Java
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That API is highly inadequate, it does not provide notification for file close events on Linux. So, given a simple case, when a file is closed, copy it to another directory does not work.
– binarytemple_picsolve
Dec 16 '...
how to get the one entry from hashmap without iterating
...iterator().next();
(Note: Checking for an empty map omitted).
Your code doesn't get all the entries in the map, it returns immediately (and breaks out of the loop) with the first entry that's found.
To print the key and value of this first element:
System.out.println("Key: "+entry.getKey()+", V...
Generate random password string with requirements in javascript
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Forcing a fixed number of characters is a bad idea. It doesn't improve the quality of the password. Worse, it reduces the number of possible passwords, so that hacking by bruteforcing becomes easier.
To generate a random word consisting of alphanumeric characters, use:
var rand...
Read only the first line of a file?
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-1; this doesn't close the file, and returns an incorrect result if the first line contains any trailing whitespace besides the newline character itself.
– Mark Amery
Oct 23 '16 at 22:51
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How to get a value from a cell of a dataframe?
... @Sophologist I agree that its ridiculous that this is required. It also does not work when you try to pass the conditionals inline; my_df.loc[my_df['Col1'] == foo]['Col2'] still returns an object of type <class 'pandas.core.series.Series'>
– user5359531
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C++ performance vs. Java/C#
... have yet so see a real life effect on this" part I wrote above apparently does exist in real life.
Native C++ Memory Usage
C++ has a memory usage different from Java/C#, and thus, has different advantages/flaws.
No matter the JIT optimization, nothing will go has fast as direct pointer access t...
Is Python strongly typed?
...trongly, dynamically typed.
Strong typing means that the type of a value doesn't change in unexpected ways. A string containing only digits doesn't magically become a number, as may happen in Perl. Every change of type requires an explicit conversion.
Dynamic typing means that runtime objects (val...
Access-Control-Allow-Origin wildcard subdomains, ports and protocols
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Doesn't work for the principal domain 'mywebsite.com'
– biology.info
Apr 25 '16 at 15:43
1
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How can I make Visual Studio's build be very verbose?
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In VS2017 this 'trick' doesn't seem to work anymore. However building in the developer prompt using msbuild with the solution or project filename as cli argument does show the cl call with its arguments.
– Emile Vrijdags
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PHP array: count or sizeof?
...that?" and having to consult the documentation.
I think it means sizeof() does not work like it does in C (calculating the size of a datatype). It probably made this mention explicitly because PHP is written in C, and provides a lot of identically named wrappers for C functions (strlen(), printf(),...