Hi,

When you talk about optimization u talk about more than one aspect like, optimization in size, optimization in performance etc. One of the important optimization is the physical size optimization, so for that u can use any obuscation and code compaction tool like Retrogaurd, Proguard etc. These tools reduces the jar size. As for programatic practices u can optimize the speed with good "J2ME" programming practices like using StringBuffer instead of string, or if ur developing a game and store the series of canvases in stack to speed up execution. Special care should be taken about creation of object and their usage.

There are many good articles available on this topic.
I hope this answers some part of it though.


Cheers