Re: ArrayList.addAll syntax

From:

Thomas Hawtin <usenet@tackline.plus.com>

Newsgroups:

comp.lang.java.help

Date:

Sat, 15 Jul 2006 15:08:06 +0100

Message-ID:

<44b8f45a$0$956$ed2619ec@ptn-nntp-reader01.plus.net>

jon23d@gmail.com wrote:

Everything works fine, but when I try to call the object's .get method
after calling .open() I am thrown a NoSuchFieldException. I am certain
that there is something screwed up with the copying of the serialized
ArrayList to the existing one. I have tried looping through, copying,
..copyAll... None seem to work.
[...]
private ArrayList<String[]> preferences;

> [...]

String[] keyPair = preferences.get(i);
if (keyPair[0]==key) { index = i; }

== on references, such as Strings, tests whether the same object is
refererd to, not whether the referred objects have the same value.
equals should be used here. When the list is deserialised, new Strings
are created which aren't == to your old keys. Similarly if you have a
key of "my-key" and try a lookup with new String("my-key") you will not
find a match.

BTW, why not use a Map of some description?

Tom Hawtin
--
Unemployed English Java programmer
http://jroller.com/page/tackline/