JEP 441, Pattern Matching for the switch, is completed in JDK 21, following four previews in JDKs 17-20 (JEPs 406, 420, 427, 433). It finalizes the feature, addressing feedback from previews, and enha ...

The default case is executed whenever the string referenced by args[i] doesn’t match any of the case labels. In other words, the user has specified an unknown option. Chained if-else vs switch ...

Allowing developers to handle an exception from the selector in switch with a case in the switch block would make switch more usable for pattern matching, the proposal says.