RFR: String.join(), StringJoiner additions

[Martin Buchholz]

On Thu, Apr 18, 2013 at 10:34 AM, Jim Gish <jim.gish at oracle.com> wrote:

> That was a nice idea, but you don't want to change the value when you do
> toString().  Otherwise, if you subsequently add a new element, you're hosed
> because you've already added on the suffix.
>
>
You can cheaply save the current length, append the suffix, call toString,
and reset the length back to the old value to avoid the overhead of String
"+".