data munging

DataMunging.java

public class DataMunging {
	public static void main(String[] args) throws IOException {
		System.out.println(
		Files.lines(Paths.get("weather.dat"))
			.map(line -> line.trim())
			.map(line -> line.split(" +"))
			.filter(elements -> elements[0].matches("[0-9\\*]+"))
			.map(elements -> new AbstractMap.SimpleEntry<>(elements[0], 
					Integer.parseInt(elements[1].replace("*", "")) - Integer.parseInt(elements[2].replace("*", "")
							)))
			.min((e1, e2) -> e1.getValue()-e2.getValue())
			.map(e -> e.getKey())
			.get()
				);
	}
}