Kotlin Programming: The Big Nerd Ranch Guide, 2nd Edition

Exceptions and Interoperability

The hero has taught the Jhava monster language, and the monster will now extend its hand in friendship … or maybe not. Add a method, extendHandInFriendship, to Jhava.java.

Listing 23.34  Throwing an exception in Java (Jhava.java)

public class Jhava {
    ...
    public void offerFood() {
        Hero.handOverFood("pizza");
    }

    public void extendHandInFriendship() throws Exception {
        throw new Exception();
    }
}

Invoke this method in Hero.kt:

Listing 23.35  Invoking a method that throws an exception (Hero.kt)

@file:JvmName("Hero")

fun main() {
    ...
    adversary.offerFood()

    adversary.extendHandInFriendship()
}
...

Run this code, and you will see that a runtime exception is thrown. It is not wise to trust a monster. ...