uni/inf1010/hw3/Oblig3.java

import java.util.ArrayList;
import java.util.Scanner;
import java.io.File;

class Oblig3 {
	public static void main(String[] args) throws Exception {
		if (args.length != 1) {
			System.out.println("Bruk: java Oblig3 <filnavn>");
			System.exit(1);
		}

		Scanner fil = new Scanner(new File(args[0]));
		ArrayList<Bil> biler = new ArrayList<>();

		while (fil.hasNextLine()) {
			String[] strs = fil.nextLine().split("\\s+");

			if (strs[0].equals("BIL")) {
				Bil b = new Bil(strs[1]);
				biler.add(b);
			} else if (strs[0].equals("EL")) {
				Elbil b = new Elbil(strs[1]);
				b.batteriStorrelse = Integer.parseInt(strs[2]);
				biler.add(b);
			} else if (strs[0].equals("FOSSIL")) {
				Fossilbil b = new Fossilbil(strs[1]);
				b.co2Utslipp = Double.parseDouble(strs[2]);
				biler.add(b);
			} else if (strs[0].equals("LASTEBIL")) {
				Lastebil b = new Lastebil(strs[1]);
				b.co2Utslipp = Double.parseDouble(strs[2]);
				b.nyttevekt = Double.parseDouble(strs[3]);
				biler.add(b);
			} else if (strs[0].equals("PERSONFOSSILBIL")) {
				Personbil b = new Personbil(strs[1]);
				b.co2Utslipp = Double.parseDouble(strs[2]);
				b.antallPassasjerer = Integer.parseInt(strs[3]);
				biler.add(b);
			} else {
				throw new Exception("Ukjent greie: "+strs[0]);
			}
		}

		for (Bil b: biler) {
			if (b instanceof Personbil) {
				Personbil p = (Personbil)b;
				System.out.println(
					"Personbil "+p.bilnummer+":\n"+
					"\tAntall passasjerer: "+p.antallPassasjerer+"\n"+
					"\tCO2-utslipp:        "+p.co2Utslipp
				);
			}
		}
	}
}