Question

I created an integer list and am trying to return the index of a specific value.
The array is 3,8,2,5,1,4,7,6 and I want to return the indexOf(3), which should be 0.

I’ve tried the following in the Eclipse Java Scrapbook after importing java.util.*:

int[] A = {3,8,2,5,1,4,7,9};
Arrays.asList(A).indexOf(3)

I have also tried:

int[] A = {3,8,2,5,1,4,7,6};
ArrayList<Integer> l = new ArrayList(Arrays.asList(A));
l.indexOf(3)

Both are returning -1. Why? How to get this to work as expected?

Answer 1

It should be Integer[] not int[] in order to make it work.

Integer[] A = {3,8,2,5,1,4,7,9};
final int i = Arrays.asList(A).indexOf(3);
System.out.println("i = " + i); // prints '0'