CODEWITHSUNDEEP
javarecursionnodessingly-linked-list
druidix
druidix

Reputation: 11

Recursively adding node to end of linkedlist

I am trying to recursively append an element to the end of a Linked List .However, Nothing seems to be added. I use a private helper method so I can use the reference as a parameter. I don't run into any exceptions, however, my test cases show that nothing at all has been added to the list! I have no idea what I'm doing wrong, and have no idea where to start. Your help is very appreciated.

public void addLast(E element) {
    addLast(element,first);
}

private void addLast(E element, Node ref) {
    if (ref == null) {
        ref = new Node(element);
        n++;
            } else if (ref.next == null) {
                    ref.next = new Node(element);
                    n++;
    } else {
        addLast(element, ref.next);
    }
}

Upvotes: 1

Views: 8144

Answers (2)

Sourabh
Sourabh

Reputation: 755

You have to do something like this. Refer this link for explanation.

private Node addLast(E element, Node ref) {
    if (ref == null) {
        ref = new Node(element);

    } else {
        ref.next = addLast(element, ref.next);
    }
    return ref;
}

Upvotes: 6

William Falcon
William Falcon

Reputation: 9813

private void addLast(Node node){

   while(root.next != null){
            root = root.next;

            if (root.next == null){
                root.next = node;
                break;
            }
    }
}

Not recursive because you don't need it...

Upvotes: 1

Related Questions