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

class Unntak {
    public static void lesFil(String filnavn) throws FileNotFoundException{
        Scanner sc = new Scanner(new File(filnavn));
        while (sc.hasNextLine()) {
            System.out.println(sc.nextLine());
        }
        sc.close();
    }
    public static void sjekkAlder(int i) {
        if (i<18) {
            throw new ArithmeticException("Ikke gyldig alder");
        }
    }
    public static void main(String[] args) {
        try {
            lesFil("tekssst.txt");
        }
        catch(FileNotFoundException e) {
            System.out.println("Fant ikke filen");
            System.exit(1);
        }
        try {
            sjekkAlder(10);
        }
        catch(ArithmeticException e){
            System.out.println(e);
        }
    }
}