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What is a 'SAM type' in Java?
...ou can declare a Callable using lambda expressions like this:
Callable<String> strCallable = () -> "Hello world!";
System.out.println(strCallable.call()); // prints "Hello world!"
Lambda expressions in this context are mostly just syntactic sugar. They look better in code than anonymous ...
Calculating the difference between two Java date instances
... the units ordered.
You just have to convert that map to an user-friendly string.
Warning
The above code snippets compute a simple diff between 2 instants. It can cause problems during a daylight saving switch, like explained in this post. This means if you compute the diff between dates with n...
Regex match one of two words
...
This will do:
/^(apple|banana)$/
to exclude from captured strings (e.g. $1,$2):
(?:apple|banana)
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Can I use a binary literal in C or C++?
...etbase will only honour bases 8, 10 and 16), but you can use either a std::string version of itoa, or (the more concise, yet marginally less efficient) std::bitset.
#include <boost/utility/binary.hpp>
#include <stdio.h>
#include <stdlib.h>
#include <bitset>
#include <iost...
Why this line xmlns:android=“http://schemas.android.com/apk/res/android” must be the first in the la
...rm Resource Identifier (URI)
A Uniform Resource Identifier (URI) is a string of characters which
identifies an Internet Resource.
The most common URI is the Uniform Resource Locator (URL) which
identifies an Internet domain address. Another, not so common type of
URI is the Universal...
How can I suppress column header output for a single SQL statement?
...
Error: Type mismatch: expected type string, but got error with empty alias
– QkiZ
Jun 4 at 13:16
...
NoClassDefFoundError: android.support.v7.internal.view.menu.MenuBuilder
...ns and change the app flow:
public static boolean isSamsung_4_2_2() {
String deviceMan = Build.MANUFACTURER;
String deviceRel = Build.VERSION.RELEASE;
return "samsung".equalsIgnoreCase(deviceMan) && deviceRel.startsWith("4.2.2");
}
Then in the activity's onCreate method:
if (...
How to do the equivalent of pass by reference for primitives in Java
...see the behavior you want
public class XYZ {
public static void main(String[] arg) {
StringBuilder toyNumber = new StringBuilder("5");
play(toyNumber);
System.out.println("Toy number in main " + toyNumber);
}
private static void play(StringBuilder toyNumber) {
...
What is a segmentation fault?
...as marked as read-only:
char *str = "Foo"; // Compiler marks the constant string as read-only
*str = 'b'; // Which means this is illegal and results in a segfault
Dangling pointer points to a thing that does not exist any more, like here:
char *p = NULL;
{
char c;
p = &c;
}
// Now p ...
Display current date and time without punctuation
... or newer):
${parameter@operator} - P operator
The expansion is a string that is the result of expanding the value of parameter as if it were a prompt string.
$ show_time() { local format='\D{%Y%m%d%H%M%S}'; echo "${format@P}"; }
$ show_time
20180724003251
...