Re: OT Friday - Random sorting

[Holger Klawitter]

Mark Benussi wrote:

> Hello.
>
>  
>
> I am trying to write a comparator that randomly sorts a collection.
>
>  
>
> I have something like this:
>
>  
>
> new Comparator() {
>
>      
>
>       /**
>
>        * @see java.util.Comparator#compare(java.lang.Object,
> java.lang.Object)
>
>        */
>
>       public int compare(Object object1, Object object2) {
>
>            
>
>             long time = new Date().getTime();
>
>  
>
>             Random random1 = new Random(time);
>
>             Integer x1 = new Integer(random1.nextInt());
>
>             random1.setSeed(++time);
>
>             Integer x2 = new Integer(random1.nextInt());
>
>            
>
>             return x1.compareTo(x2);
>
>       }
>
> }
>
>  
>
> But sadly to no avail.
>
>  
>
> Has anyone done this before or have any suggestions.

I'd just use java.util.Collections.shuffle().

--
With Kind Regards / Mit freundlichem Gru?
  Holger Klawitter (listen <at> klawitter <dot> de)


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[Mark Benussi]

Even better, thank you!

-----Original Message-----
From: news [mailto:news@...] On Behalf Of Holger Klawitter
Sent: 03 June 2005 09:06
To: tomcat-user@...
Cc: user@...
Subject: Re: OT Friday - Random sorting

Mark Benussi wrote:

> Hello.
>
>  
>
> I am trying to write a comparator that randomly sorts a collection.
>
>  
>
> I have something like this:
>
>  
>
> new Comparator() {
>
>      
>
>       /**
>
>        * @see java.util.Comparator#compare(java.lang.Object,
> java.lang.Object)
>
>        */
>
>       public int compare(Object object1, Object object2) {
>
>            
>
>             long time = new Date().getTime();
>
>  
>
>             Random random1 = new Random(time);
>
>             Integer x1 = new Integer(random1.nextInt());
>
>             random1.setSeed(++time);
>
>             Integer x2 = new Integer(random1.nextInt());
>
>            
>
>             return x1.compareTo(x2);
>
>       }
>
> }
>
>  
>
> But sadly to no avail.
>
>  
>
> Has anyone done this before or have any suggestions.

I'd just use java.util.Collections.shuffle().

--
With Kind Regards / Mit freundlichem Gruß
  Holger Klawitter (listen <at> klawitter <dot> de)


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