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https://issues.apache.org/jira/browse/ZOOKEEPER-2630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16149503#comment-16149503
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ASF GitHub Bot commented on ZOOKEEPER-2630:
-------------------------------------------

Github user afine commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/354#discussion_r136431051
  
    --- Diff: src/java/main/org/apache/jute/compiler/JRecord.java ---
    @@ -21,9 +21,7 @@
     import java.io.File;
     import java.io.FileWriter;
     import java.io.IOException;
    -import java.util.ArrayList;
    -import java.util.HashMap;
    -import java.util.Iterator;
    +import java.util.*;
    --- End diff --
    
    we generally avoid using * inputs


> 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
>            Assignee: Tamas Penzes
>            Priority: Trivial
>              Labels: newbie, refactoring
>
> 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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