What is the difference between the add and offer methods in a queue?

Posted by Finbarr on Stack Overflow See other posts from Stack Overflow or by Finbarr
Published on 2010-04-24T09:46:19Z Indexed on 2010/04/24 9:53 UTC
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Take the PriorityQueue for example http://java.sun.com/j2se/1.5.0/docs/api/java/util/PriorityQueue.html#offer(E)

According to the Collection API entry http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html the add method will often seek to ensure that an element exists within the Collection rather than adding duplicates. So my question is, what is the difference between the add and offer methods?

Is it that the Offer method will add duplicates regardless? (I doubt that it is because if a Collection should only have distinct elements this would circumvent that).

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