Flutter orderby json data

[
  {"name": "Alice", "age": 25},
  {"name": "Bob", "age": 30},
  {"name": "Charlie", "age": 20}
]

class User {
  final String name;
  final int age;

  User({required this.name, required this.age});

  factory User.fromJson(Map<String, dynamic> json) {
    return User(
      name: json['name'],
      age: json['age'],
    );
  }
}

import 'dart:convert';

List<User> parseUsers(String jsonData) {
  final parsed = json.decode(jsonData).cast<Map<String, dynamic>>();
  return parsed.map<User>((json) => User.fromJson(json)).toList();
}

void main() {
  String jsonData = '[{"name": "Alice", "age": 25},{"name": "Bob", "age": 30},{"name": "Charlie", "age": 20}]';
  List<User> users = parseUsers(jsonData);
}

users.sort((a, b) => a.name.compareTo(b.name)); // 按照姓名升序排序
users.sort((a, b) => b.age.compareTo(a.age)); // 按照年龄降序排序