Passing Data into TextField(Second page) from TextField(First page)

 void main()

{
  runApp(MyApp());
}
class MyApp extends StatelessWidget
{
  MyApp({super.key});
  @override
  Widget build(BuildContext context)
  {
    return MaterialApp(
      title: "Data Passing",
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.brown,
      ),
      home: FirstClass(),
    );
  }
}

class FirstClass extends StatelessWidget
{
  FirstClass({super.key});

  TextEditingController controller1 = new TextEditingController();
  TextEditingController controller2 = new TextEditingController();

  @override
  Widget build(BuildContext context)
  {
    return GestureDetector(
      onTap: () {
        return FocusManager.instance.primaryFocus?.unfocus();
      },
      child: Scaffold(
        appBar: AppBar(
          title: const Text("First Class"),
          centerTitle: true,
        ),
        body: Center(
          child: Container(
            width: 300.0,
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                TextField(
                  controller: controller1,
                  decoration: const InputDecoration(
                    hintText: "Enter the Name 1",
                    labelText: "Name 1",
                  ),
                ),
                const SizedBox(height: 30.0),
                TextField(
                  controller: controller2,
                  decoration: const InputDecoration(
                    hintText: "Enter the Name 2",
                    labelText: "Name 2",
                  ),
                ),
                const SizedBox(height: 30.0),
                ElevatedButton(
                  onPressed: (){
                    Navigator.push(
                      context,
                      MaterialPageRoute(
                        builder: (context){
                          return SecondClass(
                            controller1.text.toString(),
                            controller2.text.toString(),
                          );
                        },
                      ),
                    );
                  },
                  child: const Text("Go to Next Page", style: TextStyle(fontWeight: FontWeight.bold),),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class SecondClass extends StatefulWidget
{
  final String number1, number2;
  SecondClass(this.number1, this.number2,{super.key});

  @override
  State<SecondClass> createState() {
    return SecondClassState();
  }
}

class SecondClassState extends State<SecondClass>
{

  TextEditingController txt1 = new TextEditingController();
  TextEditingController txt2 = new TextEditingController();

  @override
  void initState() {
    super.initState();
    txt1.text = widget.number1.toString();
    txt2.text = widget.number2.toString();
  }

  @override
  Widget build(BuildContext context)
  {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Second Class"),
      ),
      body: Center(
        child: Container(
          width: 300.0,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text("Hello : ${widget.number1} and ${widget.number2}",
                style: const TextStyle(fontSize: 20.0, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 20.0),
              TextField(
                controller: txt1,
                decoration: InputDecoration(
                  labelText: "Name1",
                ),
              ),
              const SizedBox(height: 30.0),
              TextField(
                controller: txt2,
                decoration: InputDecoration(
                  labelText: "Name2",
                ),
              ),
              const SizedBox(height: 30.0),
              ElevatedButton(
                onPressed: (){
                  showDialog(
                    context: context,
                    builder: (context) {
                      return AlertDialog(
                        title: const Text("DATA SAVED"),
                        content: const Text("Are you sure ?"),
                        actions: <Widget>[
                          TextButton(
                            onPressed: (){
                              Navigator.pop(context);
                            },
                            child: const Text("CANCEL", style: TextStyle(fontWeight: FontWeight.bold),),
                          ),
                          TextButton(
                            onPressed: (){
                              ScaffoldMessenger.of(context).showSnackBar(
                                const SnackBar(content: Text("Data saved..."),),
                              );
                              Navigator.push(
                                context,
                                MaterialPageRoute(
                                  builder: (context){
                                    return FirstClass();
                                  },
                                ),
                              );
                            },
                            child: const Text("CONFIRM", style: TextStyle(fontWeight: FontWeight.bold),),
                          ),
                        ],
                      );
                    },
                  );
                },
                child: const Text("SAVE", style: TextStyle(fontWeight: FontWeight.bold),),
              ),
            ],
          ),
        ),
      ),
    );
  }
}