Method main

collections/PetMap.java:9–19

(String[] args)

public class PetMap {
  public static void main(String[] args) {
    Map<String, Pet> petMap = new HashMap<>();
    petMap.put("My Cat", new Cat("Molly"));
    petMap.put("My Dog", new Dog("Ginger"));
    petMap.put("My Hamster", new Hamster("Bosco"));
    System.out.println(petMap);
    Pet dog = petMap.get("My Dog");
    System.out.println(dog);
    System.out.println(petMap.containsKey("My Dog"));
    System.out.println(petMap.containsValue(dog));
  }
}
/* Output:
{My Dog=Dog Ginger, My Cat=Cat Molly, My