Write a method to append the content of a singly-linked list to the end of another singly-linked list. Your method should accept two parameters that are references to the beginning of two independent, non-empty (i.e. each list contains at least one node) lists, firstList and secondList. Your method should locate the end of the first list and append (attach) the second list to the end of the first list. Do not make a copy of the nodes on the second list, simply attach the second list to the end of the first list. Finally your method will return a reference to the first node of the combined list.

The method signature is: public static listNode appendList( listNode firstList, listNode secondList ) ;

Assume listNode is defined as follows:

class listNode

{

public int dataValue;

public listNode next;

};