Re: Object copies?

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From	Knute Johnson <september@knutejohnson.com>
Newsgroups	comp.lang.java.help
Subject	Re: Object copies?
Date	Sun, 31 Jul 2011 17:14:47 -0700
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On 7/31/2011 4:47 PM, markspace wrote:
> On 7/31/2011 4:38 PM, Knute Johnson wrote:
>
>> On 7/31/2011 4:26 PM, Patricia Shanahan wrote:
>>> FindBugs is probably complaining because you probably do not need to
>>> copy. Remember that none of the String methods modifies the String on
>>> which it is called.
>
>
>> Light Bulb! All I need is another set of references.
>
>
> Yeah, I was going to say the same as Patricia. Strings are immutable,
> always. Why do you need to make a copy?
>
> Also, what is this for? Some sort of before-and-after object, like a
> Command that can be reverted? Just save the original and the new:
>
> class StringModification implements Command {
>
> private final String before, after;
>
> public StringModification( String before, String after ) {
> this.before = before; this.after = after;
> }
>
> public String revert() { return before; }
>
> }
>
> Invoke with:
> new StringModification( str, str.replace(...) );
>
> or similar. Actually for this particular application, all you probably
> need to save is the "before" bit, but you did ask for a copy of both.
>

Thanks.

There are days when the simplest things don't seem so obvious any more. 
  I've been having one of those years.

-- 

Knute Johnson

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Thread

Object copies? Knute Johnson <september@knutejohnson.com> - 2011-07-31 15:59 -0700
  Re: Object copies? Patricia Shanahan <pats@acm.org> - 2011-07-31 16:26 -0700
    Re: Object copies? Knute Johnson <september@knutejohnson.com> - 2011-07-31 16:38 -0700
      Re: Object copies? markspace <-@.> - 2011-07-31 16:47 -0700
        Re: Object copies? Knute Johnson <september@knutejohnson.com> - 2011-07-31 17:14 -0700
  Re: Object copies? Roedy Green <see_website@mindprod.com.invalid> - 2011-08-01 08:45 -0700

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