Find merge point between two linkedlist

MergePoint.java

/*
  Insert Node at the end of a linked list 
  head pointer input could be NULL as well for empty list
  Node is defined as 
  class Node {
     int data;
     Node next;
  }
*/
int FindMergeNode(Node headA, Node headB) {
    // Complete this function
    // Do not write the main method. 
  
    Node tempB=new Node();
    while(headA!=null)
        {
        tempB=headB;
        while(tempB!=null)
            {
        if(headA==tempB)
            {
              return tempB.data;
            }
            tempB=tempB.next;
            
        }
        
        headA=headA.next;
    }
    return headA.data;

}