/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 vote185 views2 answers
Flutter listview space between items
Dart
23 votes226 views4 answers
Flutter dateFormat
Dart
9 votes218 views2 answers
Dart regex for email
Dart
-1 vote197 views1 answer
Dart code examples
Dart
24 votes174 views3 answers
Flutter svg package
Dart
6 votes180 views2 answers
Int to string dart
Dart
14 votes198 views3 answers
Alertdialog padding flutter
Dart
2 votes200 views1 answer
Dart check if object has property
Dart
1 vote191 views1 answer
Dart move item in list
Dart
-2 votes182 views1 answer
Keyboard height flutter
Dart