Consider the code which implements the add method in the

Question

Consider the following code which implements the add method in the DList class from the course videos:public void add(int pIndex, Integer pData) throws IndexOutOfBoundsException {

if (pIndex < 0 || pIndex > getSize())
throw new IndexOutOfBoundsException();

if (pIndex == getSize()) { //adding node to the end of the list
Node newNode = new Node(pData, getTail(), null);

if (isEmpty())
setHead(newNode); //////////LINE 1
else
getTail().setNext(newNode); //////////LINE 2

setTail(newNode);
}
else {
Node node = getNodeAt(pIndex);
Node newNode = new Node(pData, node.getPrev(), node);

if (pIndex != 0)
node.getPrev().setNext(newNode);

node.setPrev(newNode);
if (pIndex == 0)
setHead(newNode);
}

setSize(getSize() + 1);
}
Explain what will happen if the lines indicated are swapped.