2.2 Implement an algorithm to !nd the nth to last element of a singly linked list

findLastNth.java

        public AnyType findLastNth(int k){
		if(head == null || k <= 0)
			return null;
		if(size() < k)
			return null;
		
		Node<AnyType> tmp = head;
		for(int i = 0; i < k; i++)
			tmp = tmp.next;
		Node<AnyType> p = head;
		
		while(tmp != null){
			tmp = tmp.next;
			p = p.next;
		}
		
		return p.data;
	}