Static Variables Static Methods Using Flutter Dart

import 'package:flutter/material.dart';

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

class Holder {
  static double number = 34567890 ;
  static void message(){
    print('You are Calling Static Method');
  }

}
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MyHomePage(),
    );
  }
}
class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {

  void callStaticMember() {
    print(Holder.number);
  }

  void callStaticFunction() {
    Holder.message();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        backgroundColor: Colors.black,
        appBar: AppBar(
          backgroundColor: Colors.blue[800],
          title: Text('Static Variables Static Methods'),
        ),
        body: Center(
            child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  Container(
                      child: RaisedButton(
                        onPressed: () => callStaticMember(),
                        child: Text(' Call Static Variable '),
                        textColor: Colors.white,
                        color: Colors.green,
                      )
                  ),
                  Container(
                      child: RaisedButton(
                        onPressed: () => callStaticFunction(),
                        child: Text(' Call Static Function '),
                        textColor: Colors.white,
                        color: Colors.blue[800],
                      )
                  ),

                ])
        )
    );
  }
}