Re: Arrays.asList() doesn't work quite like I would think it should

From:

Mark Space <markspace@sbc.global.net>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 02 Oct 2007 21:17:09 -0700

Message-ID:

<cJEMi.62$R95.4@nlpi070.nbdc.sbc.com>

Ken wrote:

I've included an example of the problem I've run into. I'm trying to
randomize an array of integers, much like the following program does.
Unfortunately when I ask the system to do so, I don't get a randomized
array. Now normally this wouldn't bother me. I would just assume that
a new object is being created and then destroyed by the garbage collector
without my ever seeing it, but in this case it looks like a bug.

Isn't the whole point of the asList() interface to allow this kind of
thing?

Is this a bug in Java?

I doubt it. A more experienced Java programmer would spot this right away.

I didn't run your program (which is a shame since you did include a good
one), but I'm gonna guess that the output is a sorted, not randomized list.

Not a Java bug.

asList returns a NEW OBJECT. Your original array was never touched. Try
something like:

List myList = Arrays.asList(indicess);
Collections.shuffle(myList);

Then print out myList and see what you get.