— Scott McNealy, Sun Microsystems Chairman, President and ceo

%java Jukebox1
[Pink Moon, Somersault, 
Shiva Moon, Circles, 
Deep Channel, Passenger, 
Listen]
The songList prints out with the 
songs in the order in which they 
were added to the ArrayList (which 
is the same order the songs are in 
within the original text file).
This is definitely NOT alphabetical
!

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532
 
chapter 16
The question is, how do we get an object on one machine 
(which means a different heap/JVM) to call a method on 
another machine?
But the ArrayList class does NOT have a sort() method!
When you look in ArrayList, there doesn’t seem to be any method related to sorting. 
Walking up the inheritance hierarchy didn’t help either—it’s clear that you can’t call a sort 
method on the ArrayList. 
ArrayList has a lot of methods, 
but there’s nothing here that 
looks like it would sort...
ArrayList 
API

---

collections 
with 
generics
you are here
4
533
The question is, how do we get an object on one machine 
(which means a different heap/JVM) to call a method on 
another machine?
I do see a collection class 
called TreeSet... and the docs 
say that it keeps your data 
sorted. I wonder if I should be 
using a TreeSet instead of an 
ArrayList...
ArrayList is not the only collection
Although ArrayList is the one you’ll use most often, 
there are others for special occasions. Some of the key 
collection classes include:
$
TreeSet
Keeps the elements sorted and prevents duplicates. 
$