static initialization of arrays

Hi guys,

I started to write some Java today, see the code below. What I want to
do is produce a static array V from several static arrays A, B, ...,
but I don't want V to have any duplicate elements. I was wondering if
there is a better way of coding this up? Also, is there a way to
guarantee that arrays A, B, ... are constructed before S and V without
relying on the order in which they are declared?

Thanks,

Johan

-----------------------------------------

import java.util.*;

class StringSet extends TreeSet<String>
{
    public void addAll( String[] strings )
    {
        for (String s: strings )
        {
            add( s );
        }
    }
};

class Main
{
    private static final String[] A = { "A1", "A2", "B1" };
    private static final String[] B = { "B1", "B2" };
    ...

    private static final StringSet S =
        new StringSet ()
        {
            {
                addAll( A );
                addAll( B );
                ...
            }
        };

    private static final String[] V = S.toArray(new String[S.size()]);

    ...
}