public class Person {
    private final String first;
    private final String last;

    public Person(String first, String last) {
        this.first = first;
        this.last = last;
    }

    public String getFirst() {
        return first;
    }

    public String getLast() {
        return last;
    }

    @Override
    public String toString() {
        return "Person( first=" + first + "last=" + last + ")";
    }

    @Override
    public int hashCode() {
        return Objects.hash(first, last);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null || getClass() != obj.getClass()) return false;
        Person person = (Person) obj;
        return Objects.equals(first, person.first)
                && Objects.equals(last, person.last);

    }

    public Person copy(Object obj) {
        return null;
    }
}