Dart custom exception

class CustomException implements Exception {
  String errorMessage() {
    return ("Invalid Amount");
  }
}

void AmountException(int amount) {
  if (amount <= 0) {
    throw new CustomException();
  }
}

void main() {
  try {
    AmountException(0);
  } catch (e) {
    print(errorMessage());
  }
}

Source: stackoverflow.com

Dart custom exception

class CustomException implements Exception {
  String cause;
  CustomException(this.cause);
}

void main() {
  try {
    throwException();
  } on CustomException {
    print("custom exception is been obtained");
  }
}

throwException() {
  throw new CustomException('This is my first custom exception');
}

Source: stackoverflow.com

Similar codes

1 vote327 views2 answers
Dart loop through object
Dart
15 votes325 views2 answers
How to change input text color in flutter
Dart
1 vote356 views1 answer
Dart constructor assert
Dart
1 vote359 views1 answer
Try adding a case clause for the missing constant, or adding a default clause.dartmissing_enum_constant_in_switch.
Dart
1 vote312 views1 answer
How to get terminal http request time
Dart
9 votes315 views2 answers
How to make a column scrollable in flutter
Dart
7 votes330 views3 answers
Flutter horizontal line
Dart
1 vote329 views1 answer
Dart comments
Dart
5 votes328 views2 answers
Flutter singleton
Dart
10 votes302 views2 answers
What is the use of substring in flutter
Dart