User.java

@Entity
public class User {
  @PrimaryKey
  private int uId;
  private String uName;
  private ArrayList<String> uPets = new ArrayList<>();

  public User() {}

  public User(int id, String name, List<String> pets){
    this.uId = id;
    this.uName = name;
    this.uPets.addAll(pets);
  };

  //getters setters removed for brevity
}