如何停止StatefulWidget内部的变量更改？

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  final int myVariable = 10;

  // ...
}

class MyImmutableObject {
  final int value;

  const MyImmutableObject(this.value);
}

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  final MyImmutableObject myObject = const MyImmutableObject(10);

  // ...
}

class MyWidget extends StatelessWidget {
  final int myVariable = 10;

  @override
  Widget build(BuildContext context) {
    // ...
  }
}