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How to avoid “ConcurrentModificationException” while removing elements from `ArrayList` while iterat
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Use an Iterator and call remove():
Iterator<String> iter = myArrayList.iterator();
while (iter.hasNext()) {
String str = iter.next();
if (someCondition)
iter.remove();
}
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Key existence check in HashMap
...ue. If you definitely don't have null values in the map, just get is fine, and avoids doing two look-ups when you need the value as well.
– Jon Skeet
Apr 11 '18 at 14:33
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Converting BigDecimal to Integer
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You would call myBigDecimal.intValueExact() (or just intValue()) and it will even throw an exception if you would lose information. That returns an int but autoboxing takes care of that.
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How to add a downloaded .box file to Vagrant?
... you can also pass -f to force it to download the box again, and replace it if it already exists. e.g. vagrant box add -f my-box http://some-url
– Brad Parks
Nov 17 '16 at 14:20
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Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
I have installed MySQL server and trying to connect to it, but getting the error:
18 Answers
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How do I write outputs to the Log in Android?
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Look into android.util.Log. It lets you write to the log with various log levels, and you can specify different tags to group the output.
For example
Log.w("myApp", "no network");
will output a warning with the tag myApp and the ...
Using Node.JS, how do I read a JSON file into (server) memory?
I am doing some experimentation with Node.js and would like to read a JSON object, either from a text file or a .js file (which is better??) into memory so that I can access that object quickly from code. I realize that there are things like Mongo, Alfred, etc out there, but that is not what I need...
Check list of words in another string [duplicate]
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@Ockonal: and if you want to check that all words from that list are inside the string, just replace any() above with all()
– Nas Banov
Jul 17 '10 at 23:23
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node.js require all files in a folder?
...l look for an index.js file in that folder; if there is one, it uses that, and if there isn't, it fails.
It would probably make most sense (if you have control over the folder) to create an index.js file and then assign all the "modules" and then simply require that.
yourfile.js
var routes = requ...
Keyboard Interrupts with python's multiprocessing Pool
How can I handle KeyboardInterrupt events with python's multiprocessing Pools? Here is a simple example:
10 Answers
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