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How to use Comparator in Java to sort
...ss as a plural of something, it suggests it is an abstraction of more than one thing.
Anyway, here's a demo of how to use a Comparator<T>:
public class ComparatorDemo {
public static void main(String[] args) {
List<Person> people = Arrays.asList(
new Pers...
Import Maven dependencies in IntelliJ IDEA
...ntelliJ) and remove all *.iml files and all .idea folders (there should be one per module)
Run mvn clean install from the command line
Re-import the project into IntelliJ and pay attention when it asks you to enable auto-import
IntelliJ 2016 Update:
The Import Maven Projects automatically setting...
How to install MySQLdb (Python data access library to MySQL) on Mac OS X?
...ire 64-bit MySQL
First off, the author (still?) of MySQLdb says here that one of the most pernicious problems is that OS X comes installed with a 32 bit version of Python, but most average joes (myself included) probably jump to install the 64 bit version of MySQL. Bad move... remove the 64 bit ve...
Java 8 stream reverse order
...end to leak the Estreams name (I'm going to remove it from the post). It's one of our company's internal utility classes, which we use to supplement java.util.stream.Stream's static methods.
– Brandon
Jan 6 '16 at 20:54
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HTML5 Canvas Resize (Downscale) Image High Quality?
...very simple downsampling : to build the smaller image, they will just pick ONE pixel in the source and use its value for the destination. which 'forgets' some details and adds noise.
Yet there's an exception to that : since the 2X image downsampling is very simple to compute (average 4 pixels to ...
How to convert/parse from String to char in java?
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If your string contains exactly one character the simplest way to convert it to a character is probably to call the charAt method:
char c = s.charAt(0);
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Why would a static nested interface be used in Java?
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The question has been answered, but one good reason to use a nested interface is if its function is directly related to the class it is in. A good example of this is a Listener. If you had a class Foo and you wanted other classes to be able to listen for events...
std::string to char*
...ard I also explain some side effects of the use of this function, of which one is that you may not edit the string returned by c_str(). You mistakenly see my short examples as real problem-solving code, which it's not.
– orlp
Sep 8 '11 at 20:19
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Spring Boot - inject map from application.yml
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Nice, thanks Andy, worked like a charm! One more thing - when setting locations (to get the properties from another yml file instead of the default application.yml) on @ConfigurationProperties, it worked, except it did not result in placeholders being replaced. E.g...
How do you express binary literals in Python?
...ary format with a 0 followed by a B or b followed by a series of zeros and ones, for example:
>>> 0b0010101010
170
>>> 0B010101
21
From the Python 3 docs, these are the ways of providing integer literals in Python:
Integer literals are described by the following lexical defi...