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From: Lew <lewbloch@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: equals(), Sets, Maps, and degrees of equality
Date: Wed, 16 Nov 2011 09:15:24 -0800 (PST)
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public interface Kennel
{
  void addClient(Client client);
  void removeClient(Client client);
  boolean isClient(Client client);

  void addDog(Client client, Dog dog);
  void removeDog(Client client, Dog dog);
  boolean hasDog(Client client, Dog dog);

  Set<Dog> getDogs(Client client);

  Set<Client> getClientele();
  Set<Breed> getBreeds();
  Set<Dog> getAllDogs();
}

public interface Client
{
  String getId();
}
public interface Breed
{
  String getId();
}
public interface Dog
{
  String getId();
  Breed getBreed();
  Client getOwner();
  Calendar getBirthday();
}

-- 
Lew