How to create a custom exception and handle it in dart

Question

I have written this code to test how custom exceptions are working in the dart.

I\'m not getting the desired output could someone explain to me how to handle it??

Answer 1

You can look at the Exception part of A Tour of the Dart Language.

The following code works as expected (custom exception has been obtained is displayed in console) :

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

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

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