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What is the ellipsis (…) for in this method signature?
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Note that the arguments may also be passed as an array of JID (this makes varargs backward compatible).
– mjn
Mar 13 '10 at 19:39
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How to convert an int array to String with toString method in Java [duplicate]
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What you want is the Arrays.toString(int[]) method:
import java.util.Arrays;
int[] array = new int[lnr.getLineNumber() + 1];
int i = 0;
..
System.out.println(Arrays.toString(array));
There is a static Arrays.toString helper method for e...
What is the most accurate way to retrieve a user's correct IP address in PHP?
...cleaner way to get the IP address:
function get_ip_address(){
foreach (array('HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR') as $key){
if (array_key_exists($key, $_SERVER) === true){
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Deserializing JSON Object Array with Json.net
...> customer { get; set; }
}
Note that I'm using a List<>, not an Array. Now create the following class:
class MyListConverter : JsonConverter
{
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
var token ...
Java HashMap performance optimization / alternative
...f 1,300 objects per hash bucket = very very bad. However if I turn the two arrays into a number in base 52 I am guaranteed to get a unique hash code for every object:
public int hashCode() {
// assume that both a and b are sorted
return a[0] + powerOf52(a[1], 1) + powerOf52(b[...
efficient circular buffer?
... My guess is that its implemented as a linked list and not an array.
– e-satis
Jan 24 '17 at 14:56
1
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Converting array to list in Java
How do I convert an array to a list in Java?
19 Answers
19
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Make copy of an array
I have an array a which is constantly being updated. Let's say a = [1,2,3,4,5] . I need to make an exact duplicate copy of a and call it b . If a were to change to [6,7,8,9,10] , b should still be [1,2,3,4,5] . What is the best way to do this? I tried a for loop like:
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JavaScript equivalent of PHP's in_array()
Is there a way in JavaScript to compare values from one array and see if it is in another array?
20 Answers
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Is there a performance difference between a for loop and a for-each loop?
...e
completely. The resulting idiom
applies equally to collections and
arrays:
// The preferred idiom for iterating over collections and arrays
for (Element e : elements) {
doSomething(e);
}
When you see the colon (:), read it as
“in.” Thus, the loop above reads as
“for each...