handling Throw exception in Kotlin

In Kotlin, we can throw exceptions using the throw keyword. Here's how it works:

1. Create a custom exception class:

class MyException(message: String) : Exception(message)

2. Throw the exception:

if (someCondition) {
  throw MyException("This is an error message")
}

In the above example, whenever someCondition is true, the MyException is thrown with the message "This is an error message".

We can also use the built-in exception classes in Kotlin and throw them with a specific message:

if (someOtherCondition) {
  throw IllegalArgumentException("Invalid argument provided")
}

In the above example, the IllegalArgumentException exception is thrown with the message "Invalid argument provided".

It's important to handle exceptions when they are thrown using try-catch blocks. Here's an example of handling the MyException we created earlier:

try {
  // code that may throw MyException
} catch (e: MyException) {
  // handle MyException
  println(e.message)
}

In the above example, if MyException is thrown, it will be caught and the message will be printed out.