code: int traverseAndCountElements() {
  		int num = 0;
  
  		for (Entry<?, ?> entry : table) {
  			while (entry != null) {
  				num++;
  				entry = entry.next;
  			}
  		}
  
  		return num;
  	}
docs: For testing only: Actively counts the number of entries, rather than using the
  counter variable. This method has linear complexity, rather than constant.
  
  @return The counted number of entries.