jme????????????????????????????????????

I want to reduce the jre  size and still i
want to use javax.swing, java.lang. java.io, java.net
etc... such kind of basic packages.

Is there any tool which can probably seperate the
necessary classes (meaning the classes used by my
class) from a particular jar.
(OR)
Any idea of how to implement that?

ive no idea. I wouldnt want to alter the Java that sun produces. Java
is open source though so you could possibly configure it how you like.

why not try an older jre?