Sponsoring getting 5015163 "(str) String merge/join that is the inverse of String.split()" into JDK 7

[Joseph D. Darcy]

Hello.

Following up from threads earlier this year,

http://mail.openjdk.java.net/pipermail/core-libs-dev/2009-February/001061.html
http://mail.openjdk.java.net/pipermail/core-libs-dev/2009-March/001191.html

I'm willing and interested to sponsor getting String.join functionality 
into JDK 7.

To address this particular bug, I think there should be new "join" 
methods on String as opposed to a general "joiner" class.  A more 
general class could be added later.

Remi, please point to a current draft of the specification and 
implementation for your change.

Kevin, I'm interested in hearing your comments on the API design.

Thanks,

-Joe