Re: EnumSet and varargs

From:

Wojtek <nowhere@a.com>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 17 Sep 2008 20:52:21 GMT

Message-ID:

<mn.8b407d89619450ed.70216@a.com>

Zig wrote :

On Wed, 17 Sep 2008 09:39:09 -0400, Wojtek <nowhere@a.com> wrote:

The method add() in the EnumSet implementation ALWAYS throws an
UnsupportedOperationException, so it cannot be used.

This sounds inconsistent with my knowledge, have you tried this?

Yes. At first glance it seemed the way to go. I had a loop which added the
"bars" one by one. When I ran it, it threw that exception.

Interesting. This is my test:

import java.util.*;
import java.util.concurrent.TimeUnit;

public class EnumFiddling {
  public static void main(String[] args) {
     //empty collection
     EnumSet<TimeUnit> units=EnumSet.noneOf(TimeUnit.class);

<slaps forehead>

I forgot to initialize the EnumSet :-(

Ok, my only excuse is that it was the end of the day. And I am sticking
to that story...

     System.out.println(units);

     //add one element
     units.add(TimeUnit.SECONDS);
     System.out.println(units);

     //add a sequence of elements
     Collections.addAll(units,
       TimeUnit.MILLISECONDS,
       TimeUnit.MICROSECONDS);
     System.out.println(units);
   }
}

--
Wojtek :-)