How can I create/instantiate an array to be equal to the substring of another array, where the size of the substring is unknown:
int n; //some number derived somewhere else
String[] grp = elements[i] to elements[i+n];
Use Arrays.copyOfRange
:
public static <T> T[] copyOfRange(T[] original,
int from,
int to)
Copies the specified range of the specified array into a new array. The initial index of the range (
from
) must lie between zero andoriginal.length
, inclusive. The value atoriginal[from]
is placed into the initial element of the copy (unlessfrom == original.length
orfrom == to
). Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to
), which must be greater than or equal to from, may be greater thanoriginal.length
, in which case null is placed in all elements of the copy whose index is greater than or equal tooriginal.length - from
. The length of the returned array will beto - from
.The resulting array is of exactly the same class as the original array.
In your case:
String[] grp = Arrays.copyOfRange(elements, i, i + n);
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