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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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HTTP status code for update and delete?
...atus code is the request sent by the client is valid (DELETE mySite/entity/123) and the entity to delete does not exist.
– Martin
Dec 30 '11 at 21:27
69
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What is the exact meaning of IFS=$'\n'?
...cessary. Run new IFS in subshell to avoid overriding the default IFS:
ar=(123 321); ( IFS=$'\n'; echo ${ar[*]} )
Besides I don't really believe you recover the old IFS fully. You should double quote it to avoid line breaking such as OLDIFS="$IFS".
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Algorithm to return all combinations of k elements from n
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Usage:
var result = Combinations(new[] { 1, 2, 3, 4, 5 }, 3);
Result:
123
124
125
134
135
145
234
235
245
345
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What's the difference between interface and @interface in java?
...above annotation, you could use code like this:
@MyAnnotation(
value="123",
name="Jakob",
age=37,
newNames={"Jenkov", "Peterson"}
)
public class MyClass {
}
Reference - http://tutorials.jenkov.com/java/annotations.html
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Linux: compute a single hash for a given folder & contents?
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123
One possible way would be:
sha1sum path/to/folder/* | sha1sum
If there is a whole directory ...
How to return result of a SELECT inside a function in PostgreSQL?
...guity
END
$func$ LANGUAGE plpgsql;
Call:
SELECT * FROM word_frequency(123);
Explanation:
It is much more practical to explicitly define the return type than simply declaring it as record. This way you don't have to provide a column definition list with every function call. RETURNS TABLE is ...
Get last n lines of a file, similar to tail
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123
This may be quicker than yours. Makes no assumptions about line length. Backs through the fi...
C# vs Java Enum (for those new to C#)
...t threw it in to show usage
double earthWeight = double.Parse("123");
double earthMass = earthWeight / pEarth.SurfaceGravity();
foreach (Planet p in Planet.Values)
Console.WriteLine($"Your weight on {p} is {p.SurfaceWeight(mass)}");
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Choose Git merge strategy for specific files (“ours”, “mine”, “theirs”)
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123
Even though this question is answered, providing an example as to what "theirs" and "ours" mea...