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Date: Fri, 27 Nov 2015 21:48:12 +0000 (UTC)
From: "Thomas Neidhart (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Message-ID: <JIRA.12544629.1330526963000.212142.1448660892459@Atlassian.JIRA>
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 <JIRA.12544629.1330526963218@arcas>
Subject: [jira] [Closed] (COLLECTIONS-394) FastTreeMap is not compatible
 with TreeMap
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     [ https://issues.apache.org/jira/browse/COLLECTIONS-394?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Neidhart closed COLLECTIONS-394.
---------------------------------------

> FastTreeMap is not compatible with TreeMap
> ------------------------------------------
>
>                 Key: COLLECTIONS-394
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-394
>             Project: Commons Collections
>          Issue Type: Bug
>          Components: Map
>    Affects Versions: 3.2.1
>         Environment: all
>            Reporter: Michael Pradel
>
> FastTreeMap extends TreeMap in a way that doesn't preserve the superclass behavior. For example, the following code prints 'null', but I would expect it to print '1=1', which is what TreeMap does:
> TreeMap map = new FastTreeMap();
> //TreeMap map = new TreeMap();
> map.put(1, "1");
> map.put(3, "3");
> 		
> Entry e = map.floorEntry(2);
> System.out.println(e);
> This behavior is surprising and can hit you every time a reference of type TreeMap refers to an instance of FastTreeMap. A subclass instance used through a superclass interface shouldn't change the visible behavior of its superclass.
> The reason for this problem seems to be that FastTreeMap both extends TreeMap and delegates to a TreeMap via the 'map' field. I.e., there are  two map instances for a single FastTreeMap instance.


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