dart 中的 runtimeType 问题？

Question

为什么一个是 List<PersonEntity>， 一个是 List<dynamic>

import 'dart:convert';

const jsonString = '''
[
{
  "name": "John Smith",
  "email": "[e-mail]"
}
]
''';

class PersonEntity {
  String name;
  String email;

  PersonEntity({this.name, this.email});

  PersonEntity.fromJson(Map<String, dynamic> json) {
    name = json['name'];
    email = json['email'];
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['name'] = this.name;
    data['email'] = this.email;
    return data;
  }
}

main() {
  var parsed = json.decode(jsonString) as List;
  var parsed2 = json.decode(jsonString);

  print(parsed
      .map((c) => PersonEntity.fromJson(c))
      .toList()
      .runtimeType); // List<PersonEntity>
  print(parsed2
      .map((c) => PersonEntity.fromJson(c))
      .toList()
      .runtimeType); // List<dynamic>
}

Answer 1

为什么！有知道吗