Re: Efficiency - Vectors

From:

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 17 Apr 2007 19:57:57 -0400

Message-ID:

<46255edc$0$90262$14726298@news.sunsite.dk>

Jason Cavett wrote:

So, I've been researching how inefficient (performance-wise) Vectors
are against any other Collection that is not synchronized.
Unfortunately, it seems as if everybody has a different opinion.

I'm wondering - how inefficient are Vectors in Java 1.5 versus non-
synchronized Collection classes? Can anybody point me to an actual
study (other than people spouting off random numbers...anywhere from
2x to 10x's worse). Would it be worth it to refactor an application
I'm working on to switch from Vectors to something else (ArrayList)?

Jack Shiraz has some tests in "Java Performance Tuning".

You can also write your own test.

There are still a big relative difference.

Does it not matter at all?

Most likely - not at all.

I consider it very unlikely that a real world app would use
collections so extensively that the choice between ArrayList
and Vector will effect overall app performance.

Choose ArrayList because it is the recommended (the standard) - not
because it is faster.

Arne