Скачать или смотреть COMP 2450 Fall 2025 Lecture 20

We'll continue our foray into error handling! Today we're going to finish what we started last class: we'll finish building input validation in the form of a new kind of object attached to our domain model class (we're going specifically to add validation as an input for "type" on Pokemon, which is an enum).

Then we're going to spend some time thinking about using custom exceptions for different kinds of input validation errors, basically: we're currently able to tell the UI layer that something has gone wrong by throwing an Exception, but I want to tell the UI layer exactly what went wrong by throwing a more specific kind of exception. This is one of the few or only places in this course where we're going to extend other classes!