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From: Jan Burse <janburse@fastmail.fm>
Newsgroups: comp.lang.java.programmer
Subject: Re: Immutable Datastructures with good Sharing
Date: Sun, 06 Nov 2011 16:54:21 +0100
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To: Giovanni Azua <bravegag@hotmail.com>
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Giovanni Azua schrieb:
> Hello,
>
> I haven't read/followed the whole OP Thread discussion but I thought it was
> worth mentioning/recommending the Google "Guava Project":
> http://code.google.com/p/guava-libraries/
>
> I think they really "went to town" on that one. You have strongly typed
> Immutable Collection definitions for all Java Collection types e.g.
> ImmutableMap.Builder, ImmutableList.Builder. The design is awesome e.g. the
> Builder pattern as prescribed in Effective Java (last edition) and the
> performance gains are noticeable as well e.g. In a distributed system I have
> been working on lately, switching the attribute instances of the DTO Beans
> from ArrayList Java Collection to use instead the implementation from Guava
> gave some noticeable 15-20% Serialization performance gain e.g. Test case
> involving 1-Echo-Server and 1K-Clients.
>
> I really enjoy the improvement in code readability as well, it suits the
> appropriate template types e.g.
>
> // from
> List<RequestData>  requests = new ArrayList<RequestData>();
>
> // to
> List<RequestData>  requests = Lists.newArrayList();
>
> Guava really rocks! Would this be the Java Collections design debt now
> finally paid by Joshua Bloch?
>
> HTH,
> Best regards,
> Giovanni
>
>
>

Thank you very much for the hint. Just googled the google
code library for "Immutable". Found another project as well:

http://code.google.com/p/pcollections/

And one based on Scala:

http://code.google.com/p/scala-deque/

And some not projects which do not yet show some download.

Bye