hashCode() and equals() in Collections

How many elements does this HashSet have when hashcode() and equals() are properly overridden to store only unique elements?

    Person james = new Person("James Gosling");

    Set<Person> set = new HashSet();
    set.add(james);
    set.add(james);
    set.add(new Person("James Gosling"));

    System.out.println(set.size());