import  'package:flutter/material.dart';
void main () => runApp(MyApp());
class MyApp extends StatelessWidget{
  @override
  Widget build(BuildContext context){
    return MaterialApp(
      title: 'Junjie Chen',
      theme: ThemeData(primarySwatch: Colors.purple),
    home: MyhomePage(title:'Jerry Chen-home'),
    );
  }
}
class MyhomePage extends StatefulWidget {
  MyhomePage({Key key, this.title}):super (key:key);
final String title;
@override
_MyhomePageState createState () => _MyhomePageState();
}
class _MyhomePageState extends State<MyhomePage>{
@override
Widget build (BuildContext context){
 print('i am here ' + widget.title);
return Scaffold(
appBar: AppBar(
title: Text (widget.title),
),
body: Column(crossAxisAlignment: CrossAxisAlignment.center, mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
  children: <Widget>[
    whatgoseonrows ('Cars', 'Honda', 'Nissan'),
    whatgoseonrows ('Laptops ', 'IBM', 'Mac'),
    whatgoseonrows ('Planes', 'Boeing', 'Airbus'),
    // Junjie chen
  ],
  ) );
}
}
//Junjie chen
class whatgoseonrows extends StatelessWidget{
  final String first, second, third;
  const whatgoseonrows (this.first,this.second,this.third);
 @override
 Widget build (BuildContext context){
   return Row(children: <Widget>[
       Expanded (child: Text(first + ':', textAlign: TextAlign.center,),),
       Expanded (child: Text(second, textAlign: TextAlign.center,),),
       Expanded (child: Text(third, textAlign: TextAlign.center,),),
     ],);
 } }