Day 6- Switch Smarter in Java 21

Day 6: Learnt About Modern switch in Java 21

Goodbye Break, Hello ->

Modern switch in Java 21 allows using arrow syntax (->), so you can skip the break keyword and avoid accidental fall-throughs.

Without arrow syntax, you can use the yield keyword to return a value from a switch expression.

• To group multiple case values, use a comma-separated list: case 1,2 ->
• When using a sealed hierarchy, the compiler checks for exhaustiveness at compile time:

sealed interface Shape permits Circle, Square {} final class Circle implements Shape {} final class Square implements Shape {} String result = switch (shape) { case Circle c -> "Circle!"; case Square s -> "Square!"; }; 

• it also supports null case unlike classic java.
  case null->"no"

• It supports pattern matching and guards (when), allowing type checks and additional conditions directly in switch:
  

Object obj = 10; String result = switch (obj) { case Integer i when i > 5 -> "Large number"; case Integer i -> "Small number"; default -> "Other"; };