In 2nd preview, they used &&: https://openjdk.org/jeps/420 https://openjdk.org/jeps/420 At 3rd preview, they switched to when: https://openjdk.org/jeps/427 htt

In 2nd preview, they used &&: https://openjdk.org/jeps/420 https://openjdk.org/jeps/420 At 3rd preview, they switched to when: https://openjdk.org/jeps/427 https://openjdk.org/jeps/427 In that JEP they state: > Based upon experience and feedback we propose instead to allow when clauses in switch blocks to specify guards to pattern labels So I assume people thought && was confusing.