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When do we need curly braces around shell variables?
...er, the {} in ${} are useful if you want to expand the variable foo in the string
"${foo}bar"
since "$foobar" would instead expand the variable identified by foobar.
Curly braces are also unconditionally required when:
expanding array elements, as in ${array[42]}
using parameter expansion oper...
Constructor in an Interface?
...at calls each of these constructors.
Or in code:
interface Named { Named(String name); }
interface HasList { HasList(List list); }
class A implements Named, HasList {
/** implements Named constructor.
* This constructor should not be used from outside,
* because List parameter is missin...
How can I append a string to an existing field in MySQL?
...
You need to use the CONCAT() function in MySQL for string concatenation:
UPDATE categories SET code = CONCAT(code, '_standard') WHERE id = 1;
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Regex - Does not contain certain Characters
...character class ([^) means match anything but, so this means, beginning of string, then one or more of anything except < and >, then the end of the string.
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Variable name as a string in Javascript
Is there a way to get a variable name as a string in Javascript? (like NSStringFromSelector in Cocoa )
17 Answers
...
Write a program that will surely go into deadlock [closed]
...n("Thread finished");
}
}
}
public static void main(String[] args) {
final Object obj1 = new Object();
final Object obj2 = new Object();
final CountDownLatch latch = new CountDownLatch(2);
new Locker(obj1, obj2, latch).start();
new Locker(obj2, o...
How can I convert this foreach code to Parallel.ForEach?
...
string[] lines = File.ReadAllLines(txtProxyListPath.Text);
List<string> list_lines = new List<string>(lines);
Parallel.ForEach(list_lines, line =>
{
//Your stuff
});
...
Get DateTime.Now with milliseconds precision
... etc.
If your question is actually just around converting a DateTime to a string with millisecond precision, I'd suggest using:
string timestamp = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss.fff",
CultureInfo.InvariantCulture);
(Note that unlike your...
How to count the number of occurrences of an element in a List
...
In Java 8:
Map<String, Long> counts =
list.stream().collect(Collectors.groupingBy(e -> e, Collectors.counting()));
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Is there a pattern for initializing objects created via a DI container
....
Thus, the interface should simply be:
public interface IMyIntf
{
string RunTimeParam { get; }
}
Now define the Abstract Factory:
public interface IMyIntfFactory
{
IMyIntf Create(string runTimeParam);
}
You can now create a concrete implementation of IMyIntfFactory that creates con...