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What exactly does a jar file contain?
...a really, as Java byte code maintains a lot more metadata than most binary formats - but the class file is compiled code instead of source code.
If you either open the jar file with a zip utility or run jar xf foo.jar you can extract the files from it, and have a look at them. Note that you don't n...
iOS Detect 3G or WiFi
...s all the outdated C-like Reachability code, poured into a much more Cocoa form.
Usage like:
[EPPZReachability reachHost:hostNameOrIPaddress
completition:^(EPPZReachability *reachability)
{
if (reachability.reachableViaCellular) [self doSomeLightweightStuff];
}];
See Reachabil...
Wolfram's Rule 34 in XKCD [closed]
...scribed as a bitstring. Say it's rule 110 (my favorite). In binary, 110 is 01101110. The digit of least significance is zero. This means that if the cell and its neighbors match rule 0 above, it turns white/negative/0/false/whatever. The second least significant digit is one, so if the cell and its ...
Compare given date with today
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Uses of Action delegate in C# [closed]
... is used by the
Array.ForEach method and the
List.ForEach method to perform an
action on each element of the array or
list.
Except that, you can use it as a generic delegate that takes 1-3 parameters without returning any value.
...
Retrieve CPU usage and memory usage of a single process on Linux?
...
Launch a program and monitor it
This form is useful if you want to benchmark an executable easily:
topp() (
$* &>/dev/null &
pid="$!"
trap ':' INT
echo 'CPU MEM'
while sleep 1; do ps --no-headers -o '%cpu,%mem' -p "$pid"; done
kill "$pid...
How to find all links / pages on a website
... not as easy as you may have intially thought. Many web pages are not well-formed. Extracting all the links programmatically that human being can "recognize" is really difficult if you need to take into account all the irregular expressions.
Good luck!
...
Python: How do I make a subclass from a superclass?
...t__()
Or, same exact thing as just above, except using the zero argument form of super(), which only works inside a class definition:
class MySubClassBetter(MySuperClass):
def __init__(self):
super().__init__()
...
How to duplicate a whole line in Vim?
...the file.
:+,$g/^\s*class\s\+\i\+/t. will copy all subsequent lines of the form class xxx right after the cursor.
Reference: :help range, :help :t, :help :g, :help :m and :help :v
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Intro to GPU programming [closed]
...has this huge massively parallelized supercomputer on their desktop in the form of a graphics card GPU.
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