What do you mean by "support"? Windows does not ship with any java higher than 1.1.8 (or whatever). However there are Windows versions of the JRE that are available for all released versions of Java. IBM has an AIX SDK 1.4 - A beta version of IBM's AIX port of Java 2 SDK, Standard Edition, Version 1.4.0.
"JavaRanch, where the deer and the Certified play" - David O'Meara
You showed up just in time for the waffles! And this tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop