Michael Han created ZOOKEEPER-2630:
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Summary: Use interface type instead of implementation type when
appropriate.
Key: ZOOKEEPER-2630
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2630
Project: ZooKeeper
Issue Type: Improvement
Reporter: Michael Han
Priority: Trivial
There are a couple of places in code base where we declare a field / variable
as implementation type (i.e. HashMap, HashSet) instead of interface type (i.e.
Map, Set), while in other places we do the opposite by declaring as interface
type. A quick check indicates that most if not all of these places could be
updated so we have a consistent style over the code base (prefer using
interface type), which is also a good coding style to stick per best practice.
See more info on https://github.com/apache/zookeeper/pull/102
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