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Why does ConcurrentHashMap prevent null keys and values?
...ining the source code it appears I was wrong - they lock using a "segment" based on a bitmask of the hash.
In that case, I suspect they did it to copy Hashtable, and I suspect Hashtable did it because in the relational database world, null != null, so using a null as a key has no meaning.
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Programmatically selecting text in an input field on iOS devices (mobile Safari)
... FWIW, it works in Chrome Desktop and Android Browser, which are also based on WebKit.
– jrummell
Jun 22 '11 at 18:20
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Instance v state variables in react.js
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Function overloading in Javascript - Best practices
...ave a lot of flexibility
Take an object as the argument and use prototype based inheritance to add flexibility.
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Java: getMinutes and getHours
...alendar.get(Calendar.MONTH); // gets month number, NOTE this is zero based!
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What is the Bash equivalent of Python's pass statement
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How to convert SQL Query result to PANDAS Data Structure?
... This worked for me for 1.000.000 records fecthed from an Oracle database.
– Erdem KAYA
Oct 14 '18 at 7:39
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Find substring in the string in TWIG
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Sleeping in a batch file
...sagree with the answers I found here.
I use the following method entirely based on Windows XP capabilities to do a delay in a batch file:
DELAY.BAT:
@ECHO OFF
REM DELAY seconds
REM GET ENDING SECOND
FOR /F "TOKENS=1-3 DELIMS=:." %%A IN ("%TIME%") DO SET /A H=%%A, M=1%%B%%100, S=1%%C%%100, ENDIN...
Why do people still use primitive types in Java?
...lds. You get an Integer created for you automatically when you need a heap based java object, and you get the speed and efficiency of an int when you are just doing arithmetic and local calculations.
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