@Override
    public Iterator<T> iterator() {
        return new IteratorImpl(t -> t!=null && ((Automobile)t).getPrice() == 20.);
    }


    private class IteratorImpl implements Iterator<T> {

        boolean condition = false;
        Predicate<T> p;
        int cursor;


        IteratorImpl() {
            p = t -> true;
        }

        IteratorImpl(Predicate<T> pred) {
            p = pred;
        }

        @Override
        public boolean hasNext() {
            while (cursor != size) {
                if(p.test(automobileList[cursor])) {
                    return true;
                }
                cursor++;
            }
            return false;
        }

        @Override
        public T next() {
            T auto;
            while (hasNext()) {
                if(p.test(auto = automobileList[cursor++])) {
                    condition = true;
                    return auto;
                }
            }
            throw new NoSuchElementException();
        }

        @Override
        public void remove() {
            if (!condition) {
                throw new IllegalStateException();
            }
            condition = false;
            if (cursor != size) {
                System.arraycopy(automobileList, cursor, automobileList, cursor - 1, size - cursor);
            }
            cursor--;
            size--;
        }
    }