Re: Copying collection without duplicates

Hello!

I have the following method overriding Collection.addAll:

@Override
public boolean addAll(int index, Collection<? extends E> cln)
{
        if ( containsAll(cln) )
        {
                return false;
        }

        //build list without dupes (always)
        ArrayList<E> al = new ArrayList<E>(cln.size());

        Iterator<? extends E> itr = cln.iterator();

        while ( itr.hasNext() )
        {
                E elem = itr.next();

                if ( !contains(elem) )
                {
                        al.add(elem);
                }
        }

        cln = al;

        //allows dupes and nulls
        return super.addAll(index, cln);

}

Is there any faster way without overriding other methods?

Karsten