git: openjdk/mobile: 8233191: MulticastSocket joinGroup/leaveGroup do not specify their behavior when the outgoing interface has not been set

[duke]

Changeset: 12e43e21
Author:    Patrick Concannon <pconcannon at openjdk.org>
Date:      2019-12-09 15:54:44 +0000
URL:       https://git.openjdk.java.net/mobile/commit/12e43e21

8233191: MulticastSocket joinGroup/leaveGroup do not specify their behavior when the outgoing interface has not been set

Clarifies the behaviour of 2-arg joinGroup/leaveGroup methods when null is passed for the NetworkInteface argument. The fix also clarifies what is returned by getInterface() and getNetworkInterface() methods when no previous NetworkInterface has been set.

Reviewed-by: alanb, chegar, dfuchs

! src/java.base/share/classes/java/net/MulticastSocket.java