Re: Generics

From:
Patricia Shanahan <pats@acm.org>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 13 Mar 2008 07:53:28 -0700
Message-ID:
<13tifv9cnnqjp7a@corp.supernews.com>
Andreas Leitgeb wrote:

Lew <lew@lewscanon.com> wrote:

Andreas Leitgeb wrote:

PS2: If I need to deal with the capacity of a synchronized array-like
  Collection, how would I do this with ArrayList and
  Collections.synchronized*What* ?

What do you mean, "to deal with the capacity of a ... Collection"?


I meant, I had a look at the Javadoc for ArrayList and skimmed over
those of its methods that aren't specified by interfaces. Only
those that deal with capacity (querying and setting) are specific
to ArrayList. Plus there is also removeRange(), which it inherits
from AbstractList, and thus also isn't available through List-API.
Vector also offers these features.

While I'm not judging the practical value of these, it seems like
Vector was the only threadsafe collection that had removeRange
and a means to get/set the capacity in case a known large number
of items needs to be added, to avoid multiple incremental
re-allocations.


removeRange is not really needed, because the same job can be done using
only the List interface: myList.subList(from, to).clear();

This sort of operation requires explicit synchronization to prevent any
changes in the list between calculation of the index values and the
clear call.

Patricia

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