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What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
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123
Please also note that the ConcurrentHashMap does not allow null keys or values. So they are NOT equal alternatives of a synchronized map.
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Is it ok to use dashes in Python files when trying to import them?
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One other thing to note in your code is that import is not a function. So import(python-code)...
Xcode 6 - How to pick signing certificate/provisioning profile for Ad-Hoc distribution?
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AlexHsiehAlexHsieh
123
Remove rows with all or some NAs (missing values) in data.frame
...mptions --------------------
fakeData <- function(m, n, p){
set.seed(123)
m <- matrix(runif(m*n), nrow=m, ncol=n)
m[m<p] <- NA
return(m)
}
df <- cbind( data.frame(id = paste0('ID',seq(row_size)),
stringsAsFactors = FALSE),
data.frame(fak...
How do I print a double value without scientific notation using Java?
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123
You could use printf() with %f:
double dexp = 12345678;
System.out.printf("dexp: %f\n", dexp)...
Best way to store time (hh:mm) in a database
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Another fun problem is if you are relying on the time component, it will not account for the Daylight savings adjustments when used at different times of the year.
– Chris Seufert
Nov 23 '17 at ...
Get an object properties list in Objective-C
...}
free(properties);
}
This required me to make a 'getPropertyType' C function, which is mainly taken from an Apple code sample (can't remember right now the exact source):
static const char *getPropertyType(objc_property_t property) {
const char *attributes = property_getAttributes(proper...
Do any JVM's JIT compilers generate code that uses vectorized floating point instructions?
...╰ 0x00007fc09d1ece8e: jl 0x00007fc09d1ece60 ;*if_icmpge
Have fun storming the castle!
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Why implement interface explicitly?
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Michael BMichael B
7,21233 gold badges2424 silver badges5252 bronze badges
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How to create local notifications?
...notification.
Swift:
You AppDelegate.swift file should look like this:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
application.registerUser...