public synchronized void add(Vector v) { if(v != null) { for(int i=0; i < v.size(); i++) { add((Address)v.elementAt(i)); }
public synchronized void add(Address new_member) { if(new_member != null && !members.contains(new_member)) { members.addElement(new_member);
    public synchronized void add(Vector v) {        if(v != null) {            for(int i=0; i < v.size(); i++) {                add((Address)v.elementAt(i));            }        }    }