Convert Integer[] to int[]

[Hans Dampf]

Hello,

does anybody know how I can convert an array of Integers into an array of ints without looping over every array element? Thank You very much.

Regards,
Hans

[Tony Morris]

Originally posted by Hans Dampf:
Hello,

does anybody know how I can convert an array of Integers into an array of ints without looping over every array element? Thank You very much.

Regards,
Hans

No, nobody does.
The existance of primitive types is a language defect, which is why the require 'workaround' is counter-intuitive.

[Hans Dampf]

Hello Tony,

thank you very much for your reply. I've feared that there would be no "compact" solution.

Regards,
Hans

[Jeff Albertson]

I agree, there is no "compact" solution in the API, AFAIK.

I was playing around with some java.util stuff and I wrote the
following code. Not surprising in retrospect, but it caught me off-guard.

import java.util.*;
 
public class Test {
    public static void main(String[] args) {
        Integer[] a = {3, 1, 4, 1, 5, 9};
        int[] b = {3, 1, 4, 1, 5, 9};
        f(a,b);
    }
 
    static void f(Integer[] a, int[] b) {
        List la = Arrays.asList(a);
        List lb = Arrays.asList(b);
        System.out.println(la.size());
        System.out.println(lb.size());
    }
}

[ November 28, 2005: Message edited by: Jeff Albrechtsen ]