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Newsgroups: comp.lang.java.programmer
Date: Thu, 4 Apr 2013 01:55:43 -0700 (PDT)
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Subject: Re: Usefulness of "final"
From: paul.cager@gmail.com
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Xref: csiph.com comp.lang.java.programmer:23284

On Thursday, 4 April 2013 06:42:34 UTC+1, Leif Roar Moldskred  wrote:
> markspace <markspace@nospam.nospam> wrote:
> > 
> > ... Are you trying to tell me that final fields are 
> > not involved in immutability in Java?
> 
> For what it's worth, they're not:
> 
> public class ThisIsImmutable {
>   private String cantChangeMe;
>   public ThisIsImmutable(String value) {
>     this.cantChangeMe = value;
>   }
>   public String getCantChangeMe() {
>     return this.cantChangeMe;
>   }
> } 

Interestingly, is "ThisIsImmutable" immutable given you can do this?

 public class NowItIsnt extends ThisIsImmutable {
   public String getCantChangeMe() {
     return Integer.toString(new Random().nextInt());
   }
 }

Of course you could make ThisIsImmutable final.