immutable v. mutable objects in composition

From: javac (javac_at_mail.com)
Date: 04/29/04 

Date: 29 Apr 2004 10:37:20 -0700

object "LifeForm" has an immutable object "Location"

I want "change" the immutable Location object by generating a new
Location, but it ain't working the way i wants it to. how do i get
this to work, pls? it creates a new object, but never discards the
original, as i want it to.

also, what's the best forum for a question such as this?

i've adapted examples from:
http://java.sun.com/docs/books/performance/
http://java.sun.com/docs/books/effective/

my code:
http://www.geocities.com/cjavacjava/src/

javac@mail.com