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How to pass a function as a parameter in Java? [duplicate]
...hing
}
then call it, perhaps using an anonymous inner class:
dansMethod(100, new Callable<Integer>() {
public Integer call() {
return methodToPass();
}
});
Keep in mind this is not a 'trick'. It's just java's basic conceptual equivalent to function pointers.
...
MySQL Query GROUP BY day / month / year
..._date), MONTH(record_date), COUNT(*)
FROM stats
GROUP BY YEAR(record_date)*100 + MONTH(record_date)
I compared these versions on a big table with 1,357,918 rows (innodb),
and the 2nd version appears to have better results.
version1 (average of 10 executes): 1.404 seconds
version2 (average of 10...
How to calculate the SVG Path for an arc (of a circle)
...e
document.getElementById("arc1").setAttribute("d", describeArc(200, 400, 100, 0, 180));
and in your html
<path id="arc1" fill="none" stroke="#446688" stroke-width="20" />
Live demo
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Most efficient way to store thousand telephone numbers
...f phone numbers for which the first m bits are 1...11 - this last count is 1000(decimal). There are 2^m such counts and each count is at most 1000. If we omit the last one (because we know it is 1000 anyway), we can store all of these numbers in a contiguous block of (2^m - 1) * 10 bits. (10 bits is...
Warning message: In `…` : invalid factor level, NA generated
... of 2 variables:
$ Type : Factor w/ 1 level "": NA 1 1
$ Amount: chr "100" "0" "0"
>
> fixed <- data.frame("Type" = character(3), "Amount" = numeric(3),stringsAsFactors=FALSE)
> fixed[1, ] <- c("lunch", 100)
> str(fixed)
'data.frame': 3 obs. of 2 variables:
$ Type : chr ...
Create an empty object in JavaScript with {} or new Object()?
... Array(); over []; - with one minor exception:
var emptyArray = new Array(100);
creates a 100 item long array with all slots containing undefined - which may be nice/useful in certain situations (such as (new Array(9)).join('Na-Na ') + 'Batman!').
My recommendation
Never use new Object(); - i...
Java switch statement multiple cases
...l the time:
switch (variable)
{
case 5:
case 6:
etc.
case 100:
doSomething();
break;
}
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How do I create a nice-looking DMG for Mac OS X using command-line tools?
...ner window to false
set the bounds of container window to {400, 100, 885, 430}
set theViewOptions to the icon view options of container window
set arrangement of theViewOptions to not arranged
set icon size of theViewOptions to 72
set background...
How to clear the interpreter console?
...
Well, here's a quick hack:
>>> clear = "\n" * 100
>>> print clear
>>> ...do some other stuff...
>>> print clear
Or to save some typing, put this file in your python search path:
# wiper.py
class Wipe(object):
def __repr__(self):
...
Join a list of strings in python and wrap each string in quotation marks
...t;> timeit.Timer("""words = ['hello', 'world', 'you', 'look', 'nice'] * 100; ', '.join('"{0}"'.format(w) for w in words)""").timeit(1000)
0.32559704780578613
>>> timeit.Timer("""words = ['hello', 'world', 'you', 'look', 'nice'] * 100; '"{}"'.format('", "'.join(words))""").timeit(1000)
0...