Java 17: Pattern Matching for Switch

The Java 17 release introduces  Pattern Matching for switch as a preview language feature. Pattern matching  allows case labels with patterns rather than just constants, which gives us more flexibility when defining conditions for switch cases.  

  • Type pattern

How to perform a different action for each type of object, without using instance of?

Now the switch selector expression can be of any type.

  • Sealed class

Using pattern matching and sealed class, the compiler can check that all allowed subclasses are covered and there is no longer a need for a default case.

  • Guarded pattern

Guarded pattern allow us to perform additional checks.

The full implementation of this tutorial can be found over on GitHub.