我有 POJO 类:
@Data
@AllArgsConstructor
public class Person {
private String name;
private String surname;
}
我有一些可执行代码:
public class Main {
public static void main(String[] args) {
Person john1 = new Person("John", "Smith");
Person john2 = new Person("John", "Brown");
Person nancy1 = new Person("Nancy", "James");
Person nancy2 = new Person("Nancy", "Williams");
Person kate1 = new Person("Kate", "Fletcher");
List<Person> persons = List.of(john1, kate1, john2, nancy1, nancy2);
Map<String, List<Person>> result = persons.stream().collect(Collectors.groupingBy(Person::getName));
System.out.println(result);
}
}
我怎样才能Stream<List<Person>>
进入?并且不需要钥匙。我可以在不使用 Map-collection 的情况下获得它吗?Map<String, List<Person>>
result
UPD:每个列表中都有同名的人