在无状态窗口小部件中初始化变量的正确方式是什么？

import 'package:flutter/material.dart';

class MyWidget extends StatelessWidget {
  final String title;
  final int count;

  MyWidget({Key key, this.title, this.count}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: Center(
        child: Text('Count: $count'),
      ),
    );
  }
}