Java Programming

Hi,
I'm trying to find a way to sort an ArrayList by absolute value, similar to:
my @sortedArray= sort { abs $a <=> abs $b } @unsortedArray
in Perl

So, given an ArrayList of Integers: -7 -12 -3 5 8 9,
I want to sort them to be in the order of absolute value, namely -3 5 -7 8 9 -12

I've tried the following

public class Compare
{
    public ArrayList sortArray(ArrayList valuesToSort )
    {
        Collections.sort( valuesToSort, getComparator(  )  ) ;
        return  valuesToSort;
     }
    
    
    public static Comparator getComparator(  )
    {
        return new Comparator(  )
        {
            public int compare(Object o1, Object o2 )
            {
                return  Math.abs((Integer)o1).compareTo(Math.abs((Integer)o2));
            }
        } ;
    }

}

and then use it in some other code with

Collections.sort (valuesToSort, getComparator ( )); 

But it's not possible to use Math.abs on an Integer, and when I turn the o1 and o2 into ints, the error that I get is that I can't dereference int.

So, firstly, is there a short-cut to doing this, and secondly if there isn't, is there a good way of going about it

Many thanks,
Graham