// equalshashcode/IndividualTest.java
// (c)2020 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import collections.MapOfList;
import typeinfo.pets.*;
import java.util.*;

public class IndividualTest {
  public static void main(String[] args) {
    Set<Individual> pets = new TreeSet<>();
    for(List<? extends Pet> lp :
        MapOfList.petPeople.values())
      for(Pet p : lp)
        pets.add(p);
    pets.forEach(System.out::println);
  }
}
/* Output:
Cat Elsie May
Cat Pinkola
Cat Shackleton
Cat Stanford
Cymric Molly
Dog Margrett
Mutt Spot
Pug Louie aka Louis Snorkelstein Dupree
Rat Fizzy
Rat Freckly
Rat Fuzzy
*/