public void swap(Node x, Node y) {
int temp;
temp = x.data;
x.data = y.data;
y.data = temp;
}
public void deleteNode(Node node) {
if (node.next != null) {
node.data = node.next.data;
node.next = node.next.next;
} else {
throw new NoSuchElementException();
}
}