private static void useStreams(String filePath) throws IOException {

	long startTime = new Date().getTime();

	Files.lines(Paths.get(filePath))
		.map(line -> line.split("\\t"))
		.forEach(fields -> addStateToCity(fields[3], fields[4]));

	System.out.println("Streams took: " + (new Date().getTime() - startTime) + " ms.");
}