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Why is a ConcurrentModificationException thrown and how to debug it
...his will throw a ConcurrentModificationException when the it.hasNext() is called the second time.
The correct approach would be
Iterator it = map.entrySet().iterator();
while (it.hasNext())
{
Entry item = it.next();
it.remove();
}
Assuming this iterator supports the remo...
CSS3 Spin Animation
...ly shortens the code, the compiled CSS will include the necessary prefixes etc.
div
margin: 20px
width: 100px
height: 100px
background: #f00
+animation(spin 40000ms infinite linear)
+keyframes(spin)
from
+transform(rotate(0deg))
to
+transform(rotate(360deg))
...
Better way to get type of a Javascript variable?
...ew method 'toType' -
var toType = function(obj) {
return ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase()
}
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How do I get the n-th level parent of an element in jQuery?
...).eq(0);
where 0 is the parent level (0 is parent, 1 is parent's parent etc)
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How to duplicate virtualenv
...avorite text editor, you'll see something like:
Django==1.3
Fabric==1.0.1
etc...
Now, edit the line that says Django==x.x to say Django==1.3 (or whatever version you want to install in your new virtualenv).
Lastly, activate your new virtualenv, and run:
pip install -r requirements.txt
And pip...
View contents of database file in Android Studio
...w these steps (for actual device, scroll to the bottom):
Download and install SQLiteBrowser.
Copy the database from the device to your PC:
Android Studio versions < 3.0:
Open DDMS via Tools > Android > Android Device Monitor
Click on your device on the left.
You should see your applica...
What does “SyntaxError: Missing parentheses in call to 'print'” mean in Python?
...lt;module>
TypeError: unsupported operand type(s) for >>: 'builtin_function_or_method' and '_io.TextIOWrapper'. Did you mean "print(<message>, file=<output_stream>)"?
Since this error is raised when the code runs, rather than when it is compiled, it doesn't have access to the ...
IntelliJ IDEA: Move line?
...ess, Ctrl + W
(12) Basic Code Completion
To complete methods, keywords etc press,
Ctrl + Space
(13) Code Copy and Paste
Copy : Ctrl + C
Paste : Ctrl + V
(14) Search Operation
Specific File : Ctrl + F
Full Project : Ctrl + Shift + F
(15) Switcher Popup
Open Switcher Popup : Ctrl + ...
SHA-1 fingerprint of keystore certificate
...as test
On windows, when keytool command is not found, Go to your installed JDK Directory e.g. <YourJDKPath>\Java\jdk1.8.0_231\bin\, open command line and try the above commands for debug/release mode.
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Check if a div exists with jquery [duplicate]
...queryselectorAll()" caniuse.com/querySelector allows you to use classnames etc, but it won't for older browsers. jQuery abstracts that so you don't need to worry about it (and in fact uses queryselectorAll in the background if available).
– Alex KeySmith
Nov 8 ...