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 vote151 views1 answer
Dart get String input from user
Dart
5 votes161 views1 answer
Dartpad missing browser features
Dart
5 votes156 views2 answers
Flutter singleton
Dart
0 vote152 views3 answers
The build failed likely due to AndroidX incompatibilities in a plugin. The tool is about to try
Dart
1 vote152 views1 answer
Convert string date to datetime and format
Dart
2 votes141 views1 answer
Flutter add value to list<map<string, int>>
Dart
0 vote158 views1 answer
Dart iterable firstWhere
Dart
7 votes154 views3 answers
Flutter horizontal line
Dart
0 vote147 views1 answer
Flutter list of strings to one String
Dart
3 votes143 views1 answer
Flutter layout builder
Dart