Block async object

main.dart

void main() async {
  for (int i = 0; i < 5; i++) {
    print('hello ${i + 1}');
  }
  BlockConstructor obj = new BlockConstructor();
  await obj.ready;
  print("After instantiate");
}

class BlockConstructor {
  
  String a = "ABCD";
  
  Future ready;
  
  BlockConstructor() {
    init();
    print("Constructor");
  }
  
  void init() async {
    print(10);
    ready = new Future(() async {
      await Future.delayed(Duration(milliseconds: 1000));
      print("Delay");
    });
  }
  
}