Something

import fi.joensuu.cs.tra.*;

public class h14 {

        public static void main(String args[]) {
                TraLinkedList<Integer> lista = new TraLinkedList<Integer>();
                TraLinkedList<Integer> lista2 = new TraLinkedList<Integer>();

                for (int i = 0 ; i <= 20 ; i++) {
                        lista.insert(lista.EOL, i);
                }
                for(int i = 15 ; i <= 35 ; i++) {
                        lista2.insert(lista2.EOL, i);
                }
                t11 t = new t11();
                t.tulostaLista(lista);
                t.tulostaLista(lista2);
                t.tulostaLista(xorLists(lista, lista2));

        }
        public static TraLinkedList<Integer> xorLists(TraLinkedList lista1, TraLinkedList lista2) {
                TraLinkedList<Integer> uusilista = new TraLinkedList<Integer>();

                insertElementsByExcludingList(lista1, lista2, uusilista);
                insertElementsByExcludingList(lista2, lista1, uusilista);

                return uusilista;
        }

        public static void insertElementsByExcludingList(TraLinkedList includeList, TraLinkedList excludeList, TraLinkedList resultList) {
                ListNode nodeIter = includeList.first();

                while(nodeIter != includeList.EOL) {
                        Object element = nodeIter.getElement();

                        if(!listContainsElement(excludeList, element)) {
                                resultList.insert(resultList.EOL, element);
                        }

                nodeIter=nodeIter.next();
        }

 }
        public static Boolean listContainsElement(TraLinkedList list, Object element) {
                if(list.first() == list.EOL) {
                        return false;
                }
                else {
                        return list.find(list.first(), element) != null;
                }
        }

}