Dart Exceptions

main.dart

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class CustomException implements Exception {
  final String message;

  CustomException(this.message);

  @override
  String toString() {
    return "$runtimeType: $message";
  }
}

class SearchException extends CustomException {
  SearchException(String message) : super(message);
}

class NormalException implements Exception {
  final String message;

  NormalException(this.message);
}

class NamedConstructorException implements Exception {
  String message;

  NamedConstructorException(this.message);
  
  NamedConstructorException.fromException(Exception exception) {
    this.message = exception.toString();
  }

  @override
  String toString() {
    return "$runtimeType: $message";
  }
}

void main() {
  print(CustomException('foo bar').toString()); // CustomException: foo bar
  print(SearchException('foo bar').toString()); // SearchException: foo bar
  print(Exception('foo bar').toString()); // Exception: foo bar
  print(NamedConstructorException('foo bar')); // NamedConstructorException: foo bar
  print(NamedConstructorException.fromException(Exception('foo bar'))); // NamedConstructorException: Exception: foo bar
}