Exception Handling trong Dart

try {
  var result = riskyOperation();
} on FormatException catch (e) {
  print("Format error: $e");
} on Exception catch (e) {
  print("Exception: $e");
} catch (e, stackTrace) {
  print("Error: $e");
  print("Stack: $stackTrace");
} finally {
  print("Cleanup");
}

void validateAge(int age) {
  if (age < 0) {
    throw ArgumentError("Age cannot be negative");
  }
  if (age > 150) {
    throw RangeError("Age out of range");
  }
}

class ValidationException implements Exception {
  final String message;
  ValidationException(this.message);
  
  @override
  String toString() => "ValidationException: $message";
}
 
throw ValidationException("Invalid email");