Comparing arrays that have same elements in different order

Question

I wrote below code to compare to arrays that have same elements but in diff order.

 Integer arr1[] = {1,4,6,7,2};
 Integer arr2[] = {1,2,7,4,6};

Answer 1

If you have no duplicates you can turn the arrays into sets:

new HashSet(Arrays.asList(arr1))
    .equals(new HashSet(Arrays.asList(arr2)))

Otherwise:

List l1 = new ArrayList(Arrays.asList(arr1));
List l2 = new ArrayList(Arrays.asList(arr1));

Collections.sort(l1);
Collections.sort(l2);

l1.equals(l2);