如何将数据从模型传递到另一个dart文件并将其用作变量？

import 'package:flutter/material.dart';
import 'package:myapp/models/user_model.dart';
import 'package:myapp/screens/profile_screen.dart';

void main() {
  UserModel user = UserModel(name: 'John', age: 25);
  runApp(MyApp(user: user));
}

class MyApp extends StatelessWidget {
  final UserModel user;

  MyApp({required this.user});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: ProfileScreen(user: user),
    );
  }
}

class UserModel {
  final String name;
  final int age;

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

import 'package:flutter/material.dart';
import 'package:myapp/models/user_model.dart';

class ProfileScreen extends StatelessWidget {
  final UserModel user;

  ProfileScreen({required this.user});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Profile'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('Name: ${user.name}'),
            Text('Age: ${user.age}'),
          ],
        ),
      ),
    );
  }
}