如何在flutter中打印来自未来实例的正确值

void main() {
  printValueFromFuture();
}

Future<void> printValueFromFuture() async {
  // 异步操作
  int value = await getValueFromFuture();
  print(value);
}

Future<int> getValueFromFuture() {
  // 模拟异步操作，返回一个Future实例
  return Future.delayed(Duration(seconds: 1), () => 42);
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  Future<int> getValueFromFuture() {
    return Future.delayed(Duration(seconds: 1), () => 42);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Print Value from Future'),
        ),
        body: Center(
          child: FutureBuilder<int>(
            future: getValueFromFuture(),
            builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
              if (snapshot.connectionState == ConnectionState.waiting) {
                return CircularProgressIndicator();
              } else if (snapshot.hasError) {
                return Text('Error: ${snapshot.error}');
              } else {
                return Text('Value: ${snapshot.data}');
              }
            },
          ),
        ),
      ),
    );
  }
}