플러터

import 'package:flutter/material.dart';  void main() => runApp(HelloWorldApp());  class HelloWorldApp extends StatelessWidget {   @override   Widget build(BuildContext context) {      //MaterialApp acts as a wrapper to the app and      //provides many features like title, home, theme etc        return MaterialApp(       title: 'Hello World App',        //Scaffold acts as a binder that binds the appBar,       //bottom nav bar and other UI components at their places            home: Scaffold(          //AppBar() widget automatically creates a material app bar         appBar: AppBar(           title: Text('Hello World App'),         ),          //Center widget aligns the child in center         body: Center(           child: Text('Hello World'),         ),       ),     );   } }