test.dart

import 'package:flutter/material.dart';
void main() {
  runApp(new HelloWorld());
}
class HelloWorld extends StatefulWidget {
  @override
  _HelloWorldState createState() => _HelloWorldState();
}
class _HelloWorldState extends State<HelloWorld> {

  
   
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Hello World Example'),
        ),
        body: Text('Hello World Example'),
      ),
    );
  }
}