Exception Handling Notes

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

Java

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

Java

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

Java

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

Java

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