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PersistentSet.equals() returns false even if objects within

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xslove

Post subject: PersistentSet.equals() returns false even if objects within

Posted: Fri Sep 08, 2006 5:11 am

Newbie

Joined: Thu Mar 30, 2006 2:54 am
Posts: 11

Hi, I have mapped Set as collection within the beans. I have two sets (instances of PersistentSet) and one object within each. These object returns true for method obj.equals(obj2), but when I call set.equals(set2) it return false... It same returns for methods set.contains(), containsAll
Is it some strange behaving?
radim

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piet.t

Post subject:

Posted: Fri Sep 08, 2006 9:11 am

Regular

Joined: Fri May 12, 2006 4:05 am
Posts: 106

Hi,

the API-specification for Set states:

Quote:

Returns true if the specified object is also a set, the two sets have the same size, and every member of the specified set is contained in this set (or equivalently, every member of this set is contained in the specified set).

So the Set's content is compared using object-identity, not the equals()-method.
contains() states this even clearer:

Quote:

More formally, returns true if and only if this set contains an element e such that (o==null ? e==null : o.equals(e)).

So you will only get equal Sets if obj == obj2, not if obj.equals(obj2).

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