I know that I can download it, but I want to if the available version the stable and final version.
Stable and final are relative. I'm sure there will eventually be a 5.1, and probably a 5.2, and maybe more, before they eventually move on to 6.0 or whatever they decide to call the next one. But the official release of 5.0 is what's available now. It's not a beta, not a "release candidate". It is the official 5.0 release. So download it. Upgrading later is not going to be a big deal.
Sun reverted to JDK rather than SDK because JDK is what they called it for years, and even after Sun changed it to SDK, many of us continued to refer to it as JDK. So now we've finally won.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus