public void addToStack(T data) {
ListElement<T> element = null;
if (list.isEmpty()) {
element = new ListElement<T>(data, null, null);
} else {
element = new ListElement<T>(data, head, null);
}
list.add(0, element);
if (list.size() > maxSize) {
list.remove(maxSize);
element.delete();
}
head = element.getHead();
tail = element.getTail();
}
