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Immutability of Strings in Java
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str is not an object, it's a reference to an object. "Hello" and "Help!" are two distinct String objects. Thus, str points to a string. You can change what it points to, but not that which it points at.
Take this code, for example:
String s1 = "Hello";
String s2 = s1;
// s1 and s2 now ...
Return two and more values from a method
... should use code formatting, not text formatting. Indent lines four spaces and the weirdness caused by irb's >> prompt will go away.
– Chris Lutz
Dec 25 '09 at 15:31
4
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What is the fastest way to send 100,000 HTTP requests in Python?
... file which has 100,000 URL's. I need to send an HTTP request to each URL and print the status code. I am using Python 2.6, and so far looked at the many confusing ways Python implements threading/concurrency. I have even looked at the python concurrence library, but cannot figure out how to wri...
Increment value in mysql update query
...uery has the following note: This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information.
– aland
Mar 24 '...
How to tag an older commit in Git?
We are new to git, and I want to set a tag at the beginning of our repository.
Our production code is the same as the beginning repository, but we've made commits since then.
A tag at the beginning would allow us to "roll back" production to a known, stable state.
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Get average color of image via Javascript
...e.net/xLF38/818/
Note, this will only work with images on the same domain and in browsers that support HTML5 canvas:
function getAverageRGB(imgEl) {
var blockSize = 5, // only visit every 5 pixels
defaultRGB = {r:0,g:0,b:0}, // for non-supporting envs
canvas = document.createE...
How to identify platform/compiler from preprocessor macros?
...ompile at linux, windows, Mac OS. On windows, I must support visual studio and mingw.
4 Answers
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How can I set the aspect ratio in matplotlib?
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Third times the charm. My guess is that this is a bug and Zhenya's answer suggests it's fixed in the latest version. I have version 0.99.1.1 and I've created the following solution:
import matplotlib.pyplot as plt
import numpy as np
def forceAspect(ax,aspect=1):
im = ax.g...
brew install mysql on macOS
...ion with older versions of mysql already installed. I had the same problem and none of the above solutions worked for me. I fixed it thus:
Used brew's remove & cleanup commands, unloaded the launchctl script, then deleted the mysql directory in /usr/local/var, deleted my existing /etc/my.cnf (l...
What's the point of NSAssert, actually?
...Is that the reason why to use NSAssert? Or what else is the benefit of it? And is it right to put an NSAssert just above any assumption I make in code, like a function that should never receive a -1 as param but may a -0.9 or -1.1?
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