Common subexpression can be extracted from 'switch'

Reports switch expressions and statements where every branch has a common subexpression, and the switch can be moved inside. This action shortens the code. In many cases, it's reasonable to extract the resulting switch expression to a separate variable or method.

Example:

switch (value) {
  case 0 -> System.out.println("zero");
  case 1 -> System.out.println("one");
  case 2, 3, 4 -> System.out.println("few");
  default -> System.out.println("many");
}

After the quick-fix is applied:

System.out.println(switch (value) {
  case 0 -> "zero";
  case 1 -> "one";
  case 2, 3, 4 -> "few";
  default -> "many";
});

This inspection is applicable only for enhanced switches with arrow syntax.

New in 2022.3

Inspection Details
Available in:	IntelliJ IDEA 2023.3, Qodana for JVM 2023.3
Plugin:	Java, 233.SNAPSHOT

Last modified: 13 July 2023