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import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  /// 最低限必要な関数はbuild関数のみ
  @override
  Widget build(BuildContext context) {
    final String _title = "Sample StatelessWidget";
    final String _content1 = "This is a StatelessWidget";

    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text(_title),
        ),
        body: Center(
          child: Container(
            child: Column(
              children: <Widget>[
                Text(
                  _content1,
                  style: TextStyle(
                    fontSize: 20.0,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}