Java SE 6 is the current major release of the Java SE platform, with full
support from NetBeans IDE 5.5. Sun endeavors to foster the highest level
of transparency and collaboration on the platform with the Java community
through Project JDK 6, resulting in the following key features. Sun's Java
Multi-Platform Support, Training, and Certification can provide you the
peace of mind to develop and deploy Java solutions with confidence.

URL:
http://java.sun.com/javase/6/

Download
http://java.sun.com/javase/downloads/index.jsp

Or download from my site at department of computer engineering, Prince
of Songkla University, Thailand.
http://java.coe.psu.ac.th

Somchai