RFR 9: 8138963 : java.lang.Objects new method to default to non-null

[Roger Riggs]

Java.lang.Objects contains a number of convenience methods to make it 
easier to handle references that are null.
For example, toString(obj, nullDefault),

A new method is proposed to return the reference or a default value if 
the reference is null.
   static <T> T nonNull(T obj, T nullDefault);
Alternatives to the method name include
nonNullOrElse ( using the java.util.Optional name pattern) or
nonNullOrDefault

Please review and comment.

Webrev:
  http://cr.openjdk.java.net/~rriggs/webrev-object-non-null/

Issue:
  https://bugs.openjdk.java.net/browse/JDK-8138963

Thanks, Roger