class TestBoks {
    public static void main(String[] args) {
        Boks<String> b1 = new Boks<>();
        b1.fyll("hei");
        System.out.println(b1.hent());

        Boks<Integer> b2 = new Boks<>();
        b2.fyll(42);
        System.out.println(b2.hent());

        Boks<Person> b3 = new Boks<>();
        b3.fyll(new Person());
        System.out.println(b3.hent());
    }
}

class Person{}