public class NodeMethods {
    // provides some static methods for working with nodes
    
    // addLast -- 
    // add a new node with the given data to the end of the existing list
    public static Node addLast (int newInt, Node existing) {
        if (existing == null)  // we are the last node
            return new Node(newInt, null);
        else return new Node(existing.getData(), 
                             addLast(newInt, existing.getNext()));
    }

    // print all the members of existing list
    public static void print(Node existing) {
        if (existing == null) System.out.println();
        else {
            System.out.print(existing.getData()+" ");
            print(existing.getNext());
        }
    }
}