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What is the difference between ArrayList.clear() and ArrayList.removeAll()?
...ay elements to null.
The removeAll(Collection) method, which is inherited from AbstractCollection, removes all the elements that are in the argument collection from the collection you call the method on. It's a relatively slow operation, as it has to search through one of the collections involved.
...
Does a finally block always run?
...
from the Sun Tutorials
Note: If the JVM exits while the try
or catch code is being executed, then
the finally block may not execute.
Likewise, if the thread executing the
try or catch code is interrupted or
kill...
Easiest way to check for an index or a key in an array?
... tests only for existence [of parameter]
This answer is actually adapted from the answers for this SO question: How to tell if a string is not defined in a bash shell script?
A wrapper function:
exists(){
if [ "$2" != in ]; then
echo "Incorrect usage."
echo "Correct usage: exists {k...
Is there a way to “autosign” commits in Git with a GPG key?
...
Did you just copy and paste this from VonC's answer?
– Robbie Averill
May 15 '16 at 23:59
19
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Exposing database IDs - security risk?
...cular manager's department.
There are schemes to hide the real identifier from an end user (e.g., map between the real identifier and a temporary, user-specific identifier on the server), but I would argue that this is a form of security by obscurity. I want to focus on keeping real cryptographic s...
Setting Windows PowerShell environment variables
...ays to make environment settings permanent, but
if you are only using them from PowerShell, it's probably
a lot better to use your profile to initiate the
settings. On startup, PowerShell will run any .ps1
files it finds in the WindowsPowerShell directory under
My Documents folder. Typically you hav...
Internet Explorer 11 disable “display intranet sites in compatibility view” via meta tag not working
... to disable enterprise mode (or like this) or turn it off for that website from the Tools menu in IE.
However Enterprise Mode should in theory be overridden by the X-UA-Compatible tag, but IE might have a bug...
share
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Pass variables to Ruby script via command line
... variables and have only logical true/false values.
You can access values from environment variables:
> FIRST_NAME='Andy Warhol' ruby -e 'puts ENV["FIRST_NAME"]'
> Andy Warhol
Drawbacks are present here to, you have to set all the variables before the script invocation (only for your ruby ...
How to calculate the running time of my program? [duplicate]
...a program and now I want to calculate the total running time of my program from start to end.
6 Answers
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What does ** (double star/asterisk) and * (star/asterisk) do for parameters?
...you noted that it's an "unpacking operator", so that I could differentiate from passing by reference in C. +1
– bballdave025
Jun 8 '18 at 0:56
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