JDK-6360946 : (coll) SetFromMap.equals should perform identity check
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.util:collections
  • Affected Version: 6
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2005-12-08
  • Updated: 2012-10-08
  • Resolved: 2006-03-23
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JDK 6
6 b78Fixed
Related Reports
Relates :  
JDK-7144488 - (coll) Infinite recursion for some equals tests in Collections
Description
Jason writes:

It seems that the SetFromMap.equals should first perform the identity check on 
itself before calling equals on the wrapped keyset.  The behavior would be 
more consistent with the other collections.
Comments
SUGGESTED FIX public void clear() { m.clear(); } - public boolean equals(Object o) { return keySet.equals(o); } + public boolean equals(Object o) { + return (o == this) || keySet.equals(o); + }
08-12-2005
EVALUATION Indeed. The check preserves the reflexive property of equals as an equivalence relation, when applied to concurrent collections.
08-12-2005