Immutable classes - Trondheim Developer Conference 2017

In this talk, Marcus will describe exactly what immutable classes are. He'll tell you about their advantages and disadvantages, and show you how to create them. He'll finish by giving you concrete advice on when to use immutable classes in your daily work.

[KamilSzestowicki]

At 9 min Marcus mentioned about change key in hash map. I'm very curios how can this code look in Java. He told key color was changed from blue to gray. Some example please.

[birkhansonkan]

Are you nervous? You sound like your a bit nervous :) despite that good presentation.