git: openjdk/jdk: 8228615: Optional.empty doc should suggest using isEmpty

[Stuart Marks]

Changeset: 2b73f992
Author:    Stuart Marks <smarks at openjdk.org>
Date:      2020-12-03 19:32:53 +0000
URL:       https://git.openjdk.java.net/jdk/commit/2b73f992

8228615: Optional.empty doc should suggest using isEmpty

Reviewed-by: lancea, bpb, naoto

! src/java.base/share/classes/java/util/Optional.java
! src/java.base/share/classes/java/util/OptionalDouble.java
! src/java.base/share/classes/java/util/OptionalInt.java
! src/java.base/share/classes/java/util/OptionalLong.java