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Explain the concept of a stack frame in a nutshell
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A stack frame is a frame of data that gets pushed onto the stack. In the case of a call stack,...
How to generate UML diagrams (especially sequence diagrams) from Java code?
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16 Answers
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What does the filter parameter to createScaledBitmap do?
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edited Oct 12 '10 at 3:40
answered Oct 9 '10 at 19:45
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MongoDB: How to query for records where field is null or not set?
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If the sent_at field is not there when its not set then:
db.emails.count({sent_at: {$exists: ...
How do I run a simple bit of code in a new thread?
...an the GUI as it currently causes the form to freeze whilst the code runs (10 seconds or so).
15 Answers
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How to read a single char from the console in Java (as the user types it)?
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edited Sep 16 '17 at 0:09
stkent
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Maven: missing net.sf.json-lib
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271
Looking at the maven-central repo, you need to specify a classifier for this dependency.
Either ...
Create array of symbols
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The original answer was written back in September '11, but, starting from Ruby 2.0, there is a shorter way to create an array of symbols! This literal:
%i[address city state postal country]
will do exactly what you want.
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How to check if a URL is valid
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Use the URI module distributed with Ruby:
require 'uri'
if url =~ URI::regexp
# Correct ...
MySQL > Table doesn't exist. But it does (or it should)
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