Linked List Add Node After Another Node

LinkedListAddAfter.java

public class LinkedList<T> {
    
    // Reference to the head node
    Node head;
    
    public void addAfter(T data, T target){
        
        // create new node
        Node newNode = new Node(data, null);
        
        // check if list empty
        if(head == null){
            // set new node to tail
            head = newNode;
            return;
        }
        
        // check head value
        if(head.data == target){
            // helper method below to add newNode
            head = addAfter(head, newNode);
            return;
        }
        
        // get head reference
        Node current = head;
        
        // iterate nodes
        while(current.next != null){
            
            // check node value
            if(current.next.data == target){
                // helper method below to add newNode
                current.next = addAfter(current.next, newNode);
                return;
            }
            
            // go to next node
            current = current.next;
        }
        
        // Add to tail
        current.next = newNode;
    }
    
    // helper method to add a node after another node
    private Node addAfter(Node head, Node newNode){
        
        // set newNodes next ref. to head's next ref
        newNode.next = head.next;
        
        // set head's next to be the newNode
        head.next = newNode;
        
        // return head
        return head;
    }
    
    ...