Re: ArrayList.Iterator.remove()

Knute Johnson <>
Wed, 01 Jul 2009 15:19:30 -0700
Lew wrote:

Donkey Hottie wrote:

I was aware of the Collections, with ArrayList, but not *LinkedList*.
It's a late addition, and I have moved out from Java 1.4.2 only
lately... Now using Java 6.

Lew wrote:

Yeah, it wasn't introduced until Java 1.2, ten and a half years ago.

Patricia Shanahan wrote:

This sort of issue is one of the reasons why I read this newsgroup
regularly. It is especially valuable for a solo programmer. I know a lot
of things exist because people have asked questions about them, or they
have been recommended as solutions.

You make a very good point. However, the collections classes are
among the Java features that are quite fundamental, and when working
with such things as collections one should be in the habit of
reviewing the Javadocs to see what exists already. For one accustomed
to using the Javadocs it would be quite clear after having been
alerted to the existence of a decade-old API that the class is not
new, even if they didn't discover the class until having been alerted
to it.

Usenet is useful, but not the best as the primary source of Java
knowledge, let alone the only one. To achieve competence in Java
programming, let alone virtuosity, one must be in the habit of reading
the Javadocs, the tutorials, search engine results, and yes, even
books. It helps to be aware of third-party library sources, too, like
Apache Commons (which has even more collections classes), sourceforge
and the like.

LinkedList, HashMap, java.util.Collections and other such have been
officially part of the Java API since 1998. Like, say, large parts of
the and javax.swing packages, there's precious little reason
for a professional Java programmer not to be at least aware of their
existence, nor to think that they're brand new.


I'm with Patricia on this. I work by myself and while I read books, the
docs and the tutorials, the API is staggering in its size and
complexity. The news groups have been invaluable for me in my work. On
the Collections issue specifically, I've used them for years but I don't
know all the ins and outs of what is more efficient for a particular
type of operation. This thread gave me a lot of valuable information
that I will use in the future and now to look at code already written
with an eye to better performance.

I am not however making any excuses for the OPs ignorance of the API.
You are right about that, he should have some clue. We do get folks in
here though that have never written a lick of Java code and need to fix
something. I have to fix Perl once in a while (and I need the three
books I have for that) and have to learn new languages periodically.
Sometimes you can be pretty clueless and a good pointer or two will get
you going.

The two main reasons I inhabit these newsgroups, is that I received so
much help here when I really needed it and that I learn so many new
things by reading the posts. Not as many today as in the beginning but
like this post some valuable tidbits here and there.


Knute Johnson
email s/nospam/knute2009/

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