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

public class FilInnlesning {

    public static void main(String[] args) {
        Scanner sc = null; 
        String metafil = "";

        if (args.length == 1) {
            metafil = args[0];
        }
        else {
            System.out.println("Feil antall argumenter. Forventer ett argument: metafil-path");
            System.exit(1);
        }
        
        try {
            sc = new Scanner(new File(metafil));
        } catch (FileNotFoundException e) {
            System.out.println(e);
            System.exit(2);
        }

        ArrayList<Thread> traader = new ArrayList<>();
        String linje = "";

        while (sc.hasNextLine()) {
            linje = sc.nextLine();
            linje = linje.trim();
            Runnable filinnleser = new Filinnleser(linje);
            Thread traa = new Thread(filinnleser);
            traader.add(traa);
            traa.start();
        }

        for (Thread traa : traader) {
            try {
                traa.join();
            } catch (InterruptedException e) {
                System.out.println(e);
            }
        }

        System.out.println("Filinnlesning ferdig.");

    }
}

class Filinnleser implements Runnable {

    String filnavn;

    Filinnleser(String filnavn) {
        this.filnavn = filnavn;
    }

    @Override
    public void run() {
        Scanner sc = null; 
        try {
            sc = new Scanner(new File(filnavn));
        } catch (FileNotFoundException e) {
            System.out.println(e);
        }

        while (sc.hasNextLine()) {
            String navn = sc.nextLine();
            System.out.println(navn);
        }
    }
}