hg: jdk/sandbox: 8184693: add Pattern.isEmpty

[chris.hegarty at oracle.com]

Changeset: af4b57a556be
Author:    vtheeyarath
Date:      2018-04-18 10:30 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/af4b57a556be

8184693: add Pattern.isEmpty
Summary: added method Pattern.isEmpty
Reviewed-by: forax, chegar, smarks, psandoz, rriggs

! 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
! test/jdk/java/util/Optional/Basic.java
! test/jdk/java/util/Optional/BasicDouble.java
! test/jdk/java/util/Optional/BasicInt.java
! test/jdk/java/util/Optional/BasicLong.java