public class Animals
{
   /**
      Describes the given animal.
      @param pet an animal
      @return a string with the animal's name, a space, and
      either the trick that the animal knows (if it is a dog) or a
      string "has no tricks"
   */
   public static String describe(Animal pet)
   {
      String trick =
      trick = (pet instanceof Dog) ? ((Dog)pet).getTrick() : "has no tricks";
      return String.format("%s %s", pet.getName(), trick);
   }

   // This method is used to check your work
   public static String check(String name, String trick)
   {
      Animal pet;
      if (trick == null) pet = new Cat(name);
      else pet = new Dog(name, trick);
      return describe(pet);
   }
}