Method add

12_LinkedList.java/LL.java:45–64

(int idx, int data)

    }

    public void add(int idx, int data) {
        if(idx == 0) {
            addFirst(data);
            return;
        }
        size++;
        Node temp = head;
        int i = 0;
        while(temp != null) {
            if(i == idx-1) {//add here
                Node newNode = new Node(data);
                //insertion at middle
                newNode.next = temp.next;
                temp.next = newNode;
                return;
            }
            temp = temp.next;
            i++;
        } 
    }

    public int removeFirst() {
        if(size == 0) {