How to compare two arrays of integers order-insensitively

Question

I want Java code that can compare in this way (for example):

<1 2 3 4>  = <3 1 2 4>
<1 2 3 4> != <3 4 1 1>

I can\'t

Answer 1

I think it would be sensible to check that the lengths of both arrays are equal before doing any iterating. It's a cheap way to opt out of hard work early, and it fixes the following type of failure for the second approach you mention:

{1, 2, 3} seen as equal to {4, 3, 2, 1}