RFR: 8273484: Cleanup unnecessary null comparison before instanceof check in java.naming [v2]

[Andrey Turbanov]

> Update code checks both non-null and instance of a class in java.naming module classes.
> The checks and explicit casts could also be replaced with pattern matching for the instanceof operator.
> For example:
>     The following code:
> 
>         return (obj != null &&
>                 obj instanceof CompoundName &&
>                 impl.equals(((CompoundName)obj).impl));
> 
> 
> Can be simplified to:
>     
> 
>         return (obj instanceof CompoundName other) &&
>                 impl.equals(other.impl);
> 
> 
> See similar cleanup in java.base - https://bugs.openjdk.java.net/browse/JDK-8258422

Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:

  8273484: Cleanup unnecessary null comparison before instanceof check in java.naming

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5374/files
  - new: https://git.openjdk.java.net/jdk/pull/5374/files/0c72cddc..4b1bc753

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5374&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5374&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5374.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5374/head:pull/5374

PR: https://git.openjdk.java.net/jdk/pull/5374