Java switch expressions were added to Java in Java 12. Java switch expressions enable a switch instruction to return a value, or to be evaluated to a value, in other words. This Java switch expression tutorial explains how the new switch expressions work.

Here is a link to a textual version of this tutorial:
tutorials.jenkov.com/java/switch.html

Here is a link to the first video in this Java switch tutorial series:
   • Java Switch #1 - Java Switch Statement Basics