public class StudentHasher implements CustomHasher<Student> {
    public long hash(Student s) {
        long value = 5381;
     
        for (char c : s.getLastName().toCharArray()) {
            value = ((value << 5) + value) + (int)c;
        }
        for (char c : s.getFirstName().toCharArray()) {
            value = ((value << 5) + value) + (int)c;
        }
        return value;
    }
}