Copy value from one Text widget to another using two state variables

copy_text_2.dart

import 'package:flutter/material.dart';

class TextWidget extends StatefulWidget {
  _TextWidgetState createState() => _TextWidgetState();
}

class _TextWidgetState extends State<TextWidget> {
  String _text1 = "Value to be copied";
  String _text2 = "";
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              _text1,
              key: Key('text1')
            ),
            RaisedButton(
              onPressed: (){
                setState(() {
                  _text2 = _text1;
                });
              },
              child: Text("Copy value"),
            ),
            SizedBox(height: 40),
            Text(
              _text2,
              key: Key('text2')
            )
          ],
        ),
      ),
    );
  }
}

// End of the meaningful part



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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: TextWidget(),
    );
  }
}