private void resize() {
        final int[] ia2 = new int[2 * ia.length];
        System.arraycopy(ia, 0, ia2, 0, ia.length);
        ia = ia2;
    }
Get a data element from the list previously initialized.
Data elements are return in reverse order (lifo)

@return the data element
@throws IllegalArgumentException if no more element
main/src/main/java/cgeo/geocaching/brouter/codec/LinkedListContainer.java