Exceptions Notes

The rules that separate exception handling which helps from exception handling which hides bugs.

A custom exception names a failure in the language of your domain, which makes handling precise and messages meaningful.

Java

throw raises an exception now; throws declares that a method may raise one and leaves the handling to the caller.

Java

try guards a block, catch handles specific failures, finally always runs, and try with resources closes what you opened.

Java

Errors, checked exceptions and unchecked exceptions sit in one hierarchy, and knowing which is which decides how you should react.