Thread: Nodes

So I absolutely cannot figure out nodes. I have no clue what I am doing. I can't figure out how to do the add method. So far all I have is:

public class List{
 
    Node head = null; //the start of the linked list
    private 
 
    public void add(Object next, int index){
        if(head == null){ //adding to an empty list (changes head)
            head = new Node(next, head);     //what about index?
        }else if( ){ //adding to a single element list (changes head)
 
        }else if(){ //adding to a populated list (n>=2)
            Node temp = head;
            while(temp.next != null){
                temp = temp.next;
            }
            temp.next = new Node(next, index) //not correct.....
        }
 
    }
}

Where is the algorithm you are trying to write code to? or did you skip that part?