/Dart/Dart he default constructor is already defined. Try giving one of the constructors a name.

Dart he default constructor is already defined. Try giving one of the constructors a name.

In dart you can not have the same method/constructor name used several times 
(even with different parameters).

In your case you can either use named constructor to define 2 constructors :

class FirstClass {
  FirstClass() {}
  FirstClass.withA(a) {}
}

Source: stackoverflow.com

Similar codes

0 vote273 views1 answer
Internal shadow flutter
Dart
0 vote305 views1 answer
Random.secure dart
Dart
0 vote274 views1 answer
Flutter main.dart example
Dart
12 votes255 views2 answers
Italic text flutter
Dart
0 vote298 views1 answer
Flutter toggle color card on tap
Dart
13 votes301 views4 answers
Flutter textfield rounded
Dart
5 votes270 views1 answer
GestureDetector class
Dart
0 vote303 views1 answer
UserScrollNotification in flutter
Dart
1 vote283 views1 answer
Flutter center widget
Dart
0 vote288 views1 answer
Dart inherit from generic
Dart