Find or install Java SE JDK on Mac OS X 10.6.5

I am trying to self-learn basic programming. Downloaded NetBeans 6.9.1 and with the help of an online tutorial created a simple project. However when I try to run it by double clicking on the .jar file, nothing happens.

I am trying to either FIND or INSTALL Java SE Development Kit 6u23 and am not succeeding. Can someone please tell me how to find out if it is installed? And if this is not the correct forum for asking this type of question please let me know and I will re-post. Thanks a lot! -shabbelle

With the latest updates to OS X, the path should be

/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

If it's any help, the latest OS X (on my system at least is running...

MacGyver:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/bin$ java -version
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04-307-10M3261)
Java HotSpot(TM) 64-Bit Server VM (build 17.1-b03-307, mixed mode)

If it's in your users path, you should be able to type java -version from anywhere.