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What is the difference between i++ and ++i?
... post-increment operators. In both cases the variable is incremented, but if you were to take the value of both expressions in exactly the same cases, the result will differ.
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Sorted collection in Java
...eue". It can sort either Comparable<?>s or using a Comparator.
The difference with a List sorted using Collections.sort(...) is that this will maintain a partial order at all times, with O(log(n)) insertion performance, by using a heap data structure, whereas inserting in a sorted ArrayList w...
Why do we declare Loggers static final?
...tempts to serialize loggers
final - no need to change the logger over the lifetime of the class
Also, I prefer name log to be as simple as possible, yet descriptive.
EDIT: However there is an interesting exception to these rules:
protected final Logger log = LoggerFactory.getLogger(getClass());
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Which is better, number(x) or parseFloat(x)?
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The difference between parseFloat and Number
parseFloat/parseInt is for parsing a string, while Number/+ is for coercing a value to a number. They behave differently. But first let's look at where they behave the same:
parseFloa...
Where are the PostgreSQL logs on macOS?
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On OS X, if you're using the EnterpriseDB installation of PostgreSQL, your log files will be in /Library/PostgreSQL/8.4/data/pg_log
Of course, you'll want to substitute 8.4 for whichever version number you're running.
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In Rails - is there a rails method to convert newlines to ?
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simple_format is security risk if using it for a web app. It relies on Rails interpreting special syntax like javascript:alert(\no!\) as given in the reference. There could be endless variations and future variations for malicious hackers to work with.
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How to run a PowerShell script without displaying a window?
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I compiled the PsRun, however, if I add it to the scheduled task, it also flashes a window...
– Ciantic
Dec 12 '15 at 17:33
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No connection string named 'MyEntities' could be found in the application config file
...nced in the transformed .config-file. So that's something to look out for, if you're using config-file transformations.
– Morten Nørgaard
Feb 5 '15 at 22:24
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PHP cURL custom headers
I'm wondering if/how you can add custom headers to a cURL HTTP request in PHP. I'm trying to emulate how iTunes grabs artwork and it uses these non-standard headers:
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Is it possible to have empty RequestParam values use the defaultValue?
if I have a a request mapping similar to the following:
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