Programming Kotlin

Exception handling

Handling of exceptions is almost identical to the way Java handles exceptions with one key difference in Kotlin all exceptions are unchecked.

As a reminder, checked exceptions are those that must be declared as part of the method signature or handled inside the method. A typical example would be IOException, which is thrown by many File functions, and so ends up being declared in many places throughout the IO libraries.

Unchecked exceptions are those that do not need to be added to method signatures. A common example would be the all too familiar NullPointerException, which can be thrown anywhere. If this was a checked exception, literally every function would need to declare it!

In Kotlin, since all exceptions are unchecked, they ...