Java Guild Meeting 5/2018

Summary

Optionals is a concept that brings new advantages:

• Use of type system to avoid runtime NullPointerException
• Intention revealing APIs
• Works nicely with Streams

But every new concept brings new responsibilities.

• IsPresent is bad for you DZONE
• Uses of Optional on StackOverflow
• A nice video on how to use Optionals from Devoxx

More optionals in Java 9+:

• The or() method
• The ifPresentOrElse() method
• The stream() method