HashMap에 키당 여러 값을 어떻게 저장할 수 있나요?

// Initialize the HashMap
Map<String, List<Person>> peopleByForename = new HashMap<>();

// Populate the HashMap
List<Person> people = new ArrayList<>();
people.add(new Person("Bob Smith"));
people.add(new Person("Bob Jones"));

peopleByForename.put("Bob", people);

// Retrieve values
List<Person> bobs = peopleByForename.get("Bob");
Person bob1 = bobs.get(0);
Person bob2 = bobs.get(1);

// Define the wrapper class
class Wrapper {
    private Person person1;
    private Person person2;

    public Wrapper(Person person1, Person person2) {
        this.person1 = person1;
        this.person2 = person2;
    }

    public Person getPerson1() { return person1; }
    public Person getPerson2() { return person2; }
}

// Initialize the HashMap
Map<String, Wrapper> peopleByForename = new HashMap<>();

// Populate the HashMap
peopleByForename.put("Bob", new Wrapper(new Person("Bob Smith"), new Person("Bob Jones")));

// Retrieve values
Wrapper bobs = peopleByForename.get("Bob");
Person bob1 = bobs.getPerson1();
Person bob2 = bobs.getPerson2();

// Initialize the HashMap
Map<String, Tuple2<Person, Person>> peopleByForename = new HashMap<>();

// Populate the HashMap
peopleByForename.put("Bob", new Tuple2<>(new Person("Bob Smith"), new Person("Bob Jones")));

// Retrieve values
Tuple2<Person, Person> bobs = peopleByForename.get("Bob");
Person bob1 = bobs.Item1;
Person bob2 = bobs.Item2;