public class Name implements Comparable<Name>{
    private String firstName;
    private String lastName;
    public Name (String first, String last){
	firstName = first;
	lastName = last;
    }
    public String toString(){
	return firstName + " " + lastName;
    }
    public int compareTo (Name other){
	if (lastName.compareTo(other.lastName) < 0)
	    return -1;
	else if (lastName.compareTo(other.lastName) > 0)
	    return 1;
	else // equal last names
	    return firstName.compareTo(other.firstName);
    }
}